八年级下册卷子(初二数学真题)
八年级下册卷子(初二数学真题)

初二地理下册期末考试试题

同学们为能在初二地理的期末考试中,取得优异的成绩,同学们要准备哪些期末试卷来复习呢?下面是我为大家带来的关于初二地理下册期末考试试题,希望会给大家带来帮助。

初二地理下册期末考试试题:

一、选择题:下列各题只有一个正确答案,请把正确答案的字母代号填在答题纸的表格中。(每小题2分,计30分)

1是某区域等高线示意,据回答1、2题。

1、中表示山脊的是

A.① B.②

C.③ D.④

2、中山顶⑤的高度可能是

A.550米 B.640米

C.740米 D.820米

3、关于亚洲的自然条件,下列叙述不正确的是

A.跨纬度最广的大洲 B.四面临大洋

C.地跨寒、温、热三带 D.面积最大、西部深入亚欧大陆内部

4、读2四个省区轮廓,判断下面说法中正确的是

A.①省的简称为黔 B.②省的行政中心是太原

C.③省在我国的最东部 D.④省的自然环境特点是“高、寒”

5、下列地点中,既位于北半球,又位于东半球的地点是

A.40°N、16°E B.30°N、161°E

C.20°S、120°E  D.80°N、159°W

读3,回答6~8题。

6、根据阿米尔的头饰,判断他信仰的宗教最可能是

A.__ B. 犹太教 C.佛教 D.伊斯兰教

7、阿米尔所描述的气候类型是

A.热带雨林气候 B.热带沙漠气候

C.温带季风气候 D.地中海气候

8、从阿米尔的描述中可以判断,他会来自

A.非洲南部 B.欧洲西部

C.赤道附近 D.非洲北部

9、我国南方、北方气温不同的根本原因是:

A.海陆位置不同 B.地势高低不同

C.纬度高低不同 D.地表形态不同

10、下列说法错误的是:

A.我国是一个海陆兼备的国家,东临太平洋

B.我国是一个统一的多民族国家,各民族分布具有大杂居、小聚居的特点

C.我国人口的突出特点是人口基数大,人口增长快

D.我国地形复杂多样,气候以温带大陆性气候为主

1l、下列地形区中位于第一级阶梯的是:

A.青藏高原 B.黄土高原 C.四川盆地 D.长江中下游平原

读下,完成12~13题。

12、该所示的景观,出现在黄河的

A.上游 B.中游 C.下游 D.源头

13、形成该所示的景观的主要原因是

A.黄河上游气候趋于干旱 B.河套平原大量引水灌溉

C.黄土高原水土流失严重 D.内蒙古草原严重沙漠化

14、我国林地主要分布在

A.湿润区 B.半湿润区 C.半干旱区 D.干旱区

15、以下关于我国气温和降水的说法,不正确的是

A.冬季南北温差不大          B.夏季全国大部分地区普遍高温

C.年降水量从东南沿海向西北内陆减少 D.降水主要集中在夏秋两季

二、综合题:(最后的答案写入答题纸,每空1分,共20分)

16、读右5回答下列问题:(8分)

(1)请在4中标出地球公转的方向

(2)写出中各点的节气

A.  B.

C.  D.

(3)地球运动到中 处时,徐州的正午太阳高度达到最大,白昼时间最 ,影子处于一年中最  (长/短)

17、读右6,回答问题:(6分)

(1)中m点的经纬度是 , 。

(2)写出中数字代表的水域名称

① 洋,② 洋。

(3)河流③冲积形成了世界上面积最大的平原,该平原属于 气候

18、读7长江水系略,回答下列问题:(6分)

(1)A是 (河流); B是 (城市)。

(2)长江水能资源主要集中在 垒 河段,位于该河段上我国最大的水利枢纽工程是 ,该水电站位于 省

(3)玉树位于我国四大地理区域中的 地区。

初二地理下册期末考试试题答案:

一、 选择题:下列各题只有一个正确答案,请把正确答案的字母代号填在

表格中。(每小题2分,计30分)

l 2 3 4 5 6 7 8 9 1O 11 17 13 14 15

A C B D A D B D C D A C C A A

二、综合题:(每空1分,共20分)

l6、(1)公转方向自西向东(逆时针)

(2) 冬至 春分 夏至   秋分 (顺序一定,不能颠倒)

(3)C 长 短

l7、(1)20°S,40°W

(2)大西洋 太平洋

(3)亚马孙平原 热带雨林气候

18、(1)汉江;上海

(2)上游 三峡水利枢纽 湖北省

(3)青藏地区

看过初二地理下册期末考试试题的还看了:

1. 新人教版八年级地理下册期末试卷及答案

2. 2016八下地理期末试卷及答案

3. 八年级下册期末地理测试题及答案

4. 2016年八年级下册地理期末试卷及答案

八年级英语下册冀教版期末试题

八年级 英语期末考试与学生的学习是息息相关的。下面是我为大家整编的八年级英语下册冀教版期末试题,感谢欣赏。

八年级英语下册冀教版期末测试题

(满分100分)

一. 单项选择 (15分)

( ) 1. — What’s the     of your country, Tim?

— More than thirty-five million.

A. value B. name

C. advantage D. population

( ) 2. — Why not c onsider     the Internet for interesting information?

— Good idea!

A. search B. searches

C. searched D. searching

( ) 3. It was     of you to fight against the robber (抢劫者) just now. We’re all proud of you.

A. brave B. foolish

C. crazy D. pleasant

( ) 4. The writer     in translating this book into Chinese last month.

A. succeeded B. created

C. divided D. appeared

( ) 5. Tina has lived in China for two years, and she knows     Chinese.

A. a little of B. a little

C. a bit of D. both B and C

( ) 6. Mark didn’t wake up     his friend called him this morning.

A. before B. while

C. until D. after

( ) 7. Jack     the empty bottle on the floor and threw it into the dustbin.

A. opened up B. picked up

C. rang up D. moved up

( ) 8.     Jenny     I believe Tom’s words, because he always tells lies.

A. Either; or B. Neither; nor

C. Both; and D. Not only; but also

( ) 9. The boy’s parents     s ince he was three years old. He has to live with his grandparents.

A. died B. dead

C. were dying D. have been dead

( )10. It’s difficult     the poor man     that new house.

A. for; afford B. of; afford

C. for; to afford D. of; to afford

( )11. Judy seldom goes to the history museum,     she?

A. is B. isn’t

C. does D. doesn’t

( )12. My friend told me that she     for Shanghai on June 5th.

A. leave B. leaves

C. will leave D. would leave

( )13. — Where is your mother, Kim?

— She     Hangzhou. She’ll come back this weekend.

A. goes to B. has gone to

C. will go to D. has been to

( )14. If you drive too fast on the road, it     an accident.

A. cause B. causes

C. caused D. will cause

( )15. — Do you know    , Li Ming?

— Of course! In 2012.

A. where were the 30th Olympic Games held

B. when London hosted the 30th Olympic Games

C. which record was broken at the Olympic Games

D. how many medals did they get at the Olympic Games

二. 完形填空(10分)

Winter becomes colder and colder. People begin to wear more  16  themselves against the cold. But  17  do animals get through the long cold winter?

A number of animals, especially birds, travel to  18  places to get away from the cold. Wild geese, for example, fly south. Other animals, such as bears, snakes and squirrels,  19  most of their time eating or storing food. After enough food and energy preparation, they go to safe places to hibernate (冬眠).

Hibernation is a special and deep sleep. When animals hibernate, their body temperature drops, and their heart beat and breathing become very  20 . They look like dead ones. The largest hibernators are bears.  21  other hibernators, bears do not eat or drink while hibernating, which can last as  22  as six months.

For some cold-blooded animals,  23  gives them a good place to keep warm.  24  the weather gets cold, they move to the bottom of lakes or ponds. For insects (昆虫), most of them don’t  25  during the winter, which is called diapause (昆虫生 长的停滞期).

( )16. A. protect B. protecting

C. protects D. to protect

( )17. A. how B. what

C. where D. why

( )18. A. cooler B. warmer

C. colder D. windier

( )19. A. cost B. spend

C. take D. pay

( )20. A. quick B. strong

C. slow D. noisy

( )21. A. Instead B. Except

C. Unlike D. Without

( )22. A. long B. much

C. many D. far

( )23. A. land B. water

C. air D. space

( )24. A. Since B. When

C. For D. Even

( )25. A. sleep B. talk

C. grow D. stop

三. 阅读理解 (20分)

Zac, a first-grade student, was diagnosed (诊断) with cancer last June. He is undergoing treatment (进行治疗) but still goes to school every day, because at school he can play with Vincent. Five-year-old Vincent found out his best friend was sick, and he wanted to do everything he could to help. He wanted to show his friend that he was always with him.

When he learned Zac would lose his hair from chemotherapy (化疗), Vincent decided to shave his head. When the little boy was asked why he did that, he said, “I want to make Zac feel like he is not the only one without any hair.”

Vincent has also been learning about cancer and raising money for his best friend Zac after learning how expensive his chemotherapy is. He made more than 20 scarves and sold them. He raised more than $200 in total.

Zac’s mum is thankful that her son has such an amazing friend.

When he was asked what friendship was, Vincent looked at his friend Zac and answered, “It’s a beautiful thing.”

根据材料内容选择最佳答案,并将其标号填入题前括号内。

( )26. What happened to Zac?

A. He lost his left leg.

B. He was sick.

C. He was hurt badly.

D. He lost his family.

( )27. What does the underlined word “shave” mean in Chinese?

A. 剃光 B. 剪短 C. 染 D. 烫

( )28. To help Zac, Vincent raised money by    .

A. cutting off his hair and selling it

B. selling cookies after school

C. making scarves and selling them

D. asking other people for help

( )29. Which of the following is TRUE according to the passage?

A. Vincent has raised $100 so far.

B. Zac feels very lonely at school.

C. Zac has a truly good friend Vincent.

D. Vincent made more than 20 0 scarves.

( )30. The passage is mainly about    .

A. honesty B. courage C. ambition D. friendship

Tigers are the largest wild cats in the world. They usually go out to hunt for food when it is dark. And they hunt alone most of time. When a tiger sees an animal, it moves quickly and then jumps on the animals to kill it. Sometimes it can take the tiger several days to finish eating its food. When the tiger is full, it will cover the dead animal with leaves. Later, when the tiger is hungry again, it comes back to eat some more.

Tigers are different from others in the cat family: they like water and often jump into rivers to swim. Some tigers live in very cold places in North Korea, Russia and China. Other tigers live in warmer places—in India and parts of Southeast Asia.

But now all tigers are in danger. Some people kill tigers to use their skins for clothes, and their bodies for medicine. There is also less and less land for tigers to live in.

根据短文内容,选择正确答案。

( )31. The     is the largest wild cat in the world.

A. lion B. tiger

C. panda D. bear

( )32. Tigers like    , which is different from others in the cat family.

A. eating meat B. drinking water

C. swimming D. climbing trees

( )33. Tigers mainly live in    .

A. Asia B. Europe

C. Africa D. America

( )34. Tigers are in danger now because    .

A. s ome people kill them

B. the weather becomes warmer

C. they have less land to live in

D. both A and C

( )35. Which of the following is NOT true?

A. Tigers usually go out to look for food at night.

B. The tiger can kill a big animal very quickly.

C. The tiger covers the dead animal with leaves if it can’t eat it up.

D. Tigers like to hunt for food in small groups.

四. 词语运用(10分)

A. 根据句意及汉语提示写单词。

36. When did they       (发明) this new machine?

37. Emily is very good at       (地理), but I’m not.

38. He is a       (英雄) in the eyes of the public.

39. Please add half a       (匙) of sugar to my coffee.

40. Harry is traveling in the desert on his       (骆驼).

B. 从方框中选择恰当的单词或 短语 ,并用其正确形式填空。

twenty cover pollute danger stand out

41. Look! All the tables are      with newspapers now.

42. It’s very      to skate on the thin ice!

43. It was my sister’s      birthday. She invited many friends.

44. Emily’s red hat made her      in the crowd.

45.      has become a serious problem in the world now.

五. 连词成句(5分)

46. all, hand, they, the, by, made, kites

__________________________________.

47. away, rubbish, you, the, did, throw

__________________________________?

48. the, don’t, your, sidewalk, car, by, park

__________________________________.

49. been, long, they, abroad, have, how

__________________________________?

50. had, work, she, said, the, she, finished

__________________________________.

六. 任务型阅读(10分)

Have you ever seen the film Traveling Birds?  51  They cross the way above rivers, fields, sea and grassland.  52

But you may not feel so good if you have learnt about bird flu (禽流感) from TV or on the Internet. Some governments (政府) had to kill chickens in their cities.  53  And nearly 8,500 birds died in Russia because of bird flu.

Chickens can get bird flu from the feces (粪便) of the passing birds.  54  But it’s much more difficult to control the birds in the sky.

Luckily, scientists have found a medicine for bird flu.  55  So bird flu is still a serious problem we must face.

根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺、内容完整,并将其标号填写在下面题号后的横线上。

A.I’m sure you will love the beautiful picture when you see the film.

B.A large number of chickens and even some people died in Asia.

C.But the virus (病毒) can change easily and quickly.

D.In the film, groups of birds fly high above the sky.

E.It’s not so difficult to control the chickens in cages or on farms.

51.      52.      53.      54.      55.

七. 短文填空(10分)

从下面方框中选择适当的单词并用其正确形式填空。

hear twenty cut name happy

fun send real r ead interest

Dear Joe,

I’m glad to write to you!It was my (56)      birthday yesterday. I got a beautiful dress from my parents. My sister gave me a lovely pet dog. It made me (57)      and I liked it very much. At the same time, thank you for (58)      me a great gift.

I love reading very much. Yesterday, I found that there was a (59)      picture in TIME (《时代周刊》). So I (60)      it out to send to you. I hope you’ll like it. Also I’ve just finished an (61)      book. It is(62)      The Bat-Poet (《蝙蝠诗人》). There are some poems (诗歌) in it. I (63)      enjoy it. If you’d like to read it, I’ll send it to you.

Summer holiday is coming soon. During the summer holiday, I am trying to finish (64)

three books. What’s your plan for the holiday? Hope to (65)      from you soon!

Yours,

Betty

八. 补全对话(10分)

从方框中选择恰当的 句子 补全对话。其中有两项多余。

A: (66)

B: I’m reading a book.

A: What is it about?

B: (67)

A: Could you tell me more about it?

B: Of course! (68)        For example, cars pollute the air seriously, so we should go to work on foot or by bike.

A: You’re right. (69)

B: We’d better not throw away rubbish everywhere and not use plastic bags.

A: Yes, I think the most important thing is to stop cutting down more trees.

A: I agree. (70)        It’s also a good way to protect the environment.

B: Environment is important to us. Everyone should do something fo r it.

A. It tells us to make less pollution.

B. What else can we do?

C. It is named Save the Animals.

D. What are you doing, Mark?

E. We should plant more trees every year.

F. What kind of books do you like?

G. It’s mainly about how to save our world.

九. 书面表达 (10分)

如今,网络为我们的学习和生活带来了许多便利,但任何事物都具有两面性,它也对我们产生了一些不利的影响。请以“Advantages and disadvantages of the Internet”为题阐述一下你的观点。5ykj.com

要求:

① 字迹工整,层次清晰;

② 语句通顺,语法正确;

③ 不少于70词(开头结尾已给出,不计入总词数)。

Advantages and disadvantages of the Internet

In the modern world, the Internet has come into our life. _______________________________

______________________________________________________________________________________________________________________________________________________________

In a word, the Internet brings us not only a lot of convenience but also troubles. As students, we should make good use of the Internet.

八年级英语下册冀教版期末试题参考答案

1-5 DDAAD 6-10 CBBDC 11-15 CDBDB

16-20 DABBC 21-25 CABBC 26-30 BACCD

31-35 BCADD

36. invent 37. geography 38. hero 39. spoon 40. camel

41. covered 42. dangerous 43. twentieth 44. stand out 45. Pollution

46. They made all the kites by hand

47. Did you throw away the rubbish

48. Don’t park your car by the sidewalk

49. How long have they been abroad

50. She said she had finished the work

51-55 DABEC

56. twentieth 57. happy 58. sending 59. funny 60. cut

61. interesting 62. named 63. really 64. reading 65. hear

66-70 DGABE

One possible version:

Advantages and disadvantages of the Internet

In the modern world, the Internet has come into our life. Lots of students use the Internet as a tool for their studies. They look up the meanings of new words and learn history or geography on the Internet. They also use the Internet to read news or send e-mails.

But every coin has two sides. Some students spend too much time playing online games and chatting with friends. They are not interested in their studies. At the same time, they become weaker and weaker in body.

In a word, the Internet brings us not only a lot of convenience but also troubles. As students, we should make good use of the Internet.

八年级英语下册冀教版期末试题相关 文章 :

1. 八年级英语下册期末试卷及答案

2. 初二下册英语期末试题

3. 冀教版八年级英语上册知识点

4. 人教版八年级英语下册期末测试题

5. 2016年初二英语下期末试题

初二数学真题

初二数学试题(上)   一、选择题(本大题共15小题,每小题4分,共60分)在每小题所给的4个选项中,只有一项是符合题目要求的.请将正确答案涂在答题纸上。   1.下列长 度的三条线段能组成三角形的是   A.1,2,3 B.1, ,3 C.3,4,8 D.4,5,6   2.下面四个图形分别是节能、节水、低碳和绿色食品标志,在这四个标志中,是轴对称图形的是   A. B. C. D.   3.下列运算正确的是   A. B. C. D.   4.用长方形纸片折出直角的平分线,下列折法正确的是   A. B. C. D.   5.化简 的结果是   A. B. C. D.   6.如图,在△ABC中,∠B、∠C的平分线BE,CD相交于点F,∠ABC=42°,∠A=60°,则∠BFC=   A.118° B.119° C.120° D.121°   7.如图,在△ABC中,AB=AC,∠BAC=100°,AB的垂直平分线DE分别交AB、BC 于点D、E,则∠BAE=   A.80° B.60° C.50° D.40°   8.如图,等腰三角形ABC中,AB=AC,BD平分∠ABC,∠A=36°,则∠1的度数为   A.36° B.60° C.72° D.108°   9.在平面直角坐标系中,点(4,﹣5)关于x轴对称点的坐标为   A.(4,5) B.(﹣4,﹣5) C.(﹣4,5) D.(5,4)   10.请你计算:(1﹣x)(1+x),   (1﹣x)(1+x+x2),…,   猜想:(1﹣x)(1+x+x2+…+xn)的结果是   A. 1﹣xn+1 B. 1+xn+1 C. 1﹣xn D. 1+xn   11.在边长为a的正方形中挖去一个边长为b的小正方形(a>b)(如图甲),把余下的部分拼成一个矩形(如图乙),根据两个图形中阴影部分的面积相等,可以验证   A. (a+b)2=a2+2ab+b2 B. (a﹣b)2=a2-2ab+b2   C. (a+b)(a﹣b)= a2﹣b2 D. (a+2b)(a﹣b)=a2+ab﹣2b2   12. 下列变形正确的是   A. B. C. D.   13. 下列计算中,不正确的是   A. B.   C. D.   14. 已知 , ,则   A.4 B.3 C.12 D.1   15. 一项工程,甲单独做要x天完成,乙单独做要y天完成,则甲、乙合做完成工程需要的天数为   A. B. C. D.   二、填空题(本大题共4小题,每小题5分,共20分).   16. 因式分解: ____________________.   17. 分式方程 的解是__________.   18. 如图,将长方形ABCD沿AE折叠,得到如图的图形.已 知∠CEB′=50°,则∠AEB′的度数为________.   19. 如图,将一副直角三角板叠在一起,使直角顶点重合于点O,若∠DOC=28°,则∠AOB的度数为   .   三、解答题 (共20分)   20. (满分8分) 某市为治理污水,需要铺设一段全长为300米的污水排放管道.铺设120米后,为了尽量减少施工对城市所造成的影响,后来每天铺设管道的长度比原计划增加20%,结果共用30天完成这一任务.求后来每天铺设管道的长度.   21. (满分12分) 在△ABC中,AB=AC,点D是直线BC上一点(不与B、C重合),以AD为一边在AD的右侧作 △ADE,使AD=AE,∠DAE=∠BAC,连接CE.   (1)如图1,当点D在线段BC上,如果∠BAC=90°,求∠BCE的 度数;   (2)设∠BAC=α,∠BCE=β.   ①如图2,当点D在线段BC上移动,则α,β之间有怎样的数量关系?请说明理由;   ②当点D在直线BC上移动,则α,β之间有怎样的数量关系?请直接写出你的结论.

初二数学试题(下)   一.选择题   1.下列各式不是最简二次根式的是( )   A. B. C. D.   2.下 列根式中,与 是同类二次根式的是( )   A. B. C. D.   3. △ABC中∠A、∠B、∠C的对边分别是a、b、c,下列命题中的假命题是( )   A.如果∠C-∠B=∠A,则△ABC是直角三角形。   B.如果c2= b2—a2,则△ABC是直角三角形,且∠C=90°。   C.如果(c+a)(c-a)=b2,则△ABC是直角三角形。   D.如果∠A:∠B:∠C=5:2:3,则△ABC是直角三角形。   4. 下列命题的逆命题是真命题的个数为( )   (1)对顶角相等;(2)等腰三角形的两个底角相等;(3)三组边分别相等的两个三角形全等.   A.0个 B.1个 C.2个 D.3个   5.一个直角三角形,有两边长分别为6和8,下列说法正确的是( )   A.第三边为 B.三角形的周长为25   C.三角形的面积为48 D.第三边可能为10   6.顺次连结四边形四条边的中点,所得的四边形是矩形,则原四边形一定是( )   A.平行四边形 B. 对角线相等的四边形 C. 矩形 D. 对角线互相垂直的四边形   7. 已知一个菱形的周长是20cm,两条对角线的比是4∶3,则这个菱形的`面积是( )   A.12cm2 B. 24cm2 C. 48cm2 D. 96cm2   8. 若 , ,则 ( )   A. B. C. D.   9.下列四个说法:   ①一组对角相等,一组邻角互补的四边形是平行四边形;   ②一组对边平行,另一组对边相等的四边形是平行四边形;   ③一组对边平行,一组对角相等的四边形是平行四边形;   ④一组对边相等,一组对角相等的四边形是平行四边形;其中说法正确的个数是( )   A.1个 B.2个 C.3个 D.4个   10. 如图,D是△ABC内一点,BD⊥CD,AD=6,BD=4,CD=3,E、F、G、H分别是AB、AC、CD、BD的中点,则四边形EFGH的周长是( ) ①5√8-2√32+√50

=5*3√2-2*4√2+5√2

=√2(15-8+5)

=12√2

②√6-√3/2-√2/3

=√6-√6/2-√6/3

=√6/6

③(√45+√27)-(√4/3+√125)

=(3√5+3√3)-(2√3/3+5√5)

=-2√5+7√5/3

④(√4a-√50b)-2(√b/2+√9a)

=(2√a-5√2b)-2(√2b/2+3√a)

=-4√a-6√2b

⑤√4x*(√3x/2-√x/6)

=2√x(√6x/2-√6x/6)

=2√x*(√6x/3)

=2/3*|x|*√6

⑥(x√y-y√x)÷√xy

=x√y÷√xy-y√x÷√xy

=√x-√y

⑦(3√7+2√3)(2√3-3√7)

=(2√3)^2-(3√7)^2

=12-63

=-51

⑧(√32-3√3)(4√2+√27)

=(4√2-3√3)(4√2+3√3)

=(4√2)^2-(3√3)^2

=32-27

=5

⑨(3√6-√4)?

=(3√6)^2-2*3√6*√4+(√4)^2

=54-12√6+4

=58-12√6

⑩(1+√2-√3)(1-√2+√3)

=[1+(√2-√3)][1-(√2-√3)]

=1-(√2-√3)^2

=1-(2+3+2√6)

=-4-2√6

(1)5√12×√18

=5*2√3*3√2

=30√6;

(2)-6√45×(-4√48)

=6*3√5*4*4√3

=288√15;

(3)√(12a)×√(3a) /4

=√(36a^2)/4

=6a/4

=3a/2.

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

有理数练习

练习一(B级)

(一)计算题:

(1)23+(-73) (2)(-84)+(-49) (3)7+(-2.04) (4)4.23+(-7.57) (5)(-7/3)+(-7/6) (6)9/4+(-3/2) (7)3.75+(2.25)+5/4 (8)-3.75+(+5/4)+(-1.5)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

1.125*3+125*5+25*3+25

2.9999*3+101*11*(101-92)

3.(23/4-3/4)*(3*6+2)

4. 3/7 × 49/9 - 4/3

5. 8/9 × 15/36 + 1/27

6. 12× 5/6 – 2/9 ×3

7. 8× 5/4 + 1/4

8. 6÷ 3/8 – 3/8 ÷6

9. 4/7 × 5/9 + 3/7 × 5/9

10. 5/2 -( 3/2 + 4/5 )

11. 7/8 + ( 1/8 + 1/9 )

12. 9 × 5/6 + 5/6

13. 3/4 × 8/9 - 1/3

14. 7 × 5/49 + 3/14

15. 6 ×( 1/2 + 2/3 )

16. 8 × 4/5 + 8 × 11/5

17. 31 × 5/6 – 5/6

18. 9/7 - ( 2/7 – 10/21 )

19. 5/9 × 18 – 14 × 2/7

20. 4/5 × 25/16 + 2/3 × 3/4

21. 14 × 8/7 – 5/6 × 12/15

22. 17/32 – 3/4 × 9/24

23. 3 × 2/9 + 1/3

24. 5/7 × 3/25 + 3/7

25. 3/14 ×× 2/3 + 1/6

26. 1/5 × 2/3 + 5/6

27. 9/22 + 1/11 ÷ 1/2

28. 5/3 × 11/5 + 4/3

29. 45 × 2/3 + 1/3 × 15

30. 7/19 + 12/19 × 5/6

31. 1/4 + 3/4 ÷ 2/3

32. 8/7 × 21/16 + 1/2

33. 101 × 1/5 – 1/5 × 21

34.50+160÷40

35.120-144÷18+35

36.347+45×2-4160÷52

37(58+37)÷(64-9×5)

38.95÷(64-45)

39.178-145÷5×6+42

40.812-700÷(9+31×11)

41.85+14×(14+208÷26)

43.120-36×4÷18+35

44.(58+37)÷(64-9×5)

45.(6.8-6.8×0.55)÷8.5

46.0.12× 4.8÷0.12×4.8

47.(3.2×1.5+2.5)÷1.6

48.6-1.6÷4= 5.38+7.85-5.37=

49.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

50.6.5×(4.8-1.2×4)=

51.5.8×(3.87-0.13)+4.2×3.74

52.32.52-(6+9.728÷3.2)×2.5

53.[(7.1-5.6)×0.9-1.15] ÷2.5

54.5.4÷[2.6×(3.7-2.9)+0.62]

55.12×6÷(12-7.2)-6

56.12×6÷7.2-6

57.0.68×1.9+0.32×1.9

58.58+370)÷(64-45)

59.420+580-64×21÷28

60.136+6×(65-345÷23)

15-10.75×0.4-5.7

62.18.1+(3-0.299÷0.23)×1

63.(6.8-6.8×0.55)÷8.5

64.0.12× 4.8÷0.12×4.8

65.(3.2×1.5+2.5)÷1.6

66.3.2×6+(1.5+2.5)÷1.6

67.0.68×1.9+0.32×1.9

68.10.15-10.75×0.4-5.7

69.5.8×(3.87-0.13)+4.2×3.74

70.32.52-(6+9.728÷3.2)×2.5

71.[(7.1-5.6)×0.9-1.15] ÷2.5

72.5.4÷[2.6×(3.7-2.9)+0.62]

73.12×6÷(12-7.2)-6

74.12×6÷7.2-6

75.33.02-(148.4-90.85)÷2.5

1) 76.(25%-695%-12%)*36

77./4*3/5+3/4*2/5

78.1-1/4+8/9/7/9

79.+1/6/3/24+2/21

80./15*3/5

81.3/4/9/10-1/6

82./3+1/2)/5/6-1/3]/1/7

83./5+3/5/2+3/4

84.(2-2/3/1/2)]*2/5

85.+5268.32-2569

86.3+456-52*8

87.5%+6325

88./2+1/3+1/4

2) 89+456-78

3) 5%+. 3/7 × 49/9 - 4/3

4) 9 × 15/36 + 1/27

5) 2× 5/6 – 2/9 ×3

6) 3× 5/4 + 1/4

7) 94÷ 3/8 – 3/8 ÷6

8) 95/7 × 5/9 + 3/7 × 5/9

9) 6/2 -( 3/2 + 4/5 )

10) 8 + ( 1/8 + 1/9 )

11) 8 × 5/6 + 5/6

12) 1/4 × 8/9 - 1/3

13) 10 × 5/49 + 3/14

14) 1.5 ×( 1/2 + 2/3 )

15) 2/9 × 4/5 + 8 × 11/5

16) 3.1 × 5/6 – 5/6

17) 4/7 - ( 2/7 – 10/21 )

18) 19 × 18 – 14 × 2/7

19) 5 × 25/16 + 2/3 × 3/4

20) 4 × 8/7 – 5/6 × 12/15

21) 7/32 – 3/4 × 9/24

22) 1、 2/3÷1/2-1/4×2/5

2、 2-6/13÷9/26-2/3

3、 2/9+1/2÷4/5+3/8

4、 10÷5/9+1/6×4

5、 1/2×2/5+9/10÷9/20

6、 5/9×3/10+2/7÷2/5

7、 1/2+1/4×4/5-1/8

8、 3/4×5/7×4/3-1/2

9、 23-8/9×1/27÷1/27

10、 8×5/6+2/5÷4

11、 1/2+3/4×5/12×4/5

12、 8/9×3/4-3/8÷3/4

13、 5/8÷5/4+3/23÷9/11

23) 1.2×2.5+0.8×2.5

24) 8.9×1.25-0.9×1.25

25) 12.5×7.4×0.8

26) 9.9×6.4-(2.5+0.24)(27) 6.5×9.5+6.5×0.5

0.35×1.6+0.35×3.4

0.25×8.6×4

6.72-3.28-1.72

0.45+6.37+4.55

5.4+6.9×3-(25-2.5)2×41846-620-380

4.8×46+4.8×54

0.8+0.8×2.5

1.25×3.6×8×2.5-12.5×2.4

28×12.5-12.5×20

23.65-(3.07+3.65)

(4+0.4×0.25)8×7×1.25

1.65×99+1.65

27.85-(7.85+3.4)

48×1.25+50×1.25×0.2×8

7.8×9.9+0.78

(1010+309+4+681+6)×12

3×9146×782×6×854

5.15×7/8+6.1-0.60625

1. 3/7 × 49/9 - 4/3

2. 8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4. 8× 5/4 + 1/4

5. 6÷ 3/8 – 3/8 ÷6

6. 4/7 × 5/9 + 3/7 × 5/9

7. 5/2 -( 3/2 + 4/5 )

8. 7/8 + ( 1/8 + 1/9 )

9. 9 × 5/6 + 5/6

10. 3/4 × 8/9 - 1/3

11. 7 × 5/49 + 3/14

12. 6 ×( 1/2 + 2/3 )

13. 8 × 4/5 + 8 × 11/5

14. 31 × 5/6 – 5/6

15. 9/7 - ( 2/7 – 10/21 )

16. 5/9 × 18 – 14 × 2/7

17. 4/5 × 25/16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/15

19. 17/32 – 3/4 × 9/24

20. 3 × 2/9 + 1/3

21. 5/7 × 3/25 + 3/7

22. 3/14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24. 9/22 + 1/11 ÷ 1/2

25. 5/3 × 11/5 + 4/3

26. 45 × 2/3 + 1/3 × 15

27. 7/19 + 12/19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29. 8/7 × 21/16 + 1/2

30. 101 × 1/5 – 1/5 × 21

31.50+160÷40 (58+370)÷(64-45)

32.120-144÷18+35

33.347+45×2-4160÷52

34(58+37)÷(64-9×5)

35.95÷(64-45)

36.178-145÷5×6+42 420+580-64×21÷28

37.812-700÷(9+31×11) (136+64)×(65-345÷23)

38.85+14×(14+208÷26)

39.(284+16)×(512-8208÷18)

40.120-36×4÷18+35

41.(58+37)÷(64-9×5)

42.(6.8-6.8×0.55)÷8.5

43.0.12× 4.8÷0.12×4.8

44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

45.6-1.6÷4= 5.38+7.85-5.37=

46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

48.10.15-10.75×0.4-5.7

49.5.8×(3.87-0.13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

51.[(7.1-5.6)×0.9-1.15] ÷2.5

52.5.4÷[2.6×(3.7-2.9)+0.62]

53.12×6÷(12-7.2)-6 (4)12×6÷7.2-6

102×4.5

7.8×6.9+2.2×6.9

5.6×0.25

8×(20-1.25)

1)127+352+73+44 (2)89+276+135+33

(1)25+71+75+29 +88 (2)243+89+111+57

9405-2940÷28×21

920-1680÷40÷7

690+47×52-398

148+3328÷64-75

360×24÷32+730

2100-94+48×54

51+(2304-2042)×23

4215+(4361-716)÷81

(247+18)×27÷25

36-720÷(360÷18)

1080÷(63-54)×80

(528+912)×5-6178

8528÷41×38-904

264+318-8280÷69

(174+209)×26- 9000

814-(278+322)÷15

1406+735×9÷45

3168-7828÷38+504

796-5040÷(630÷7)

285+(3000-372)÷36

1+5/6-19/12

3x(-9)+7x(-9

(-54)x1/6x(-1/3)

1.18.1+(3-0.299÷0.23)×1

2.(6.8-6.8×0.55)÷8.5

3.0.12× 4.8÷0.12×4.8

4.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

5.6-1.6÷4= 5.38+7.85-5.37=

6.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

7.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

8.10.15-10.75×0.4-5.7

9.5.8×(3.87-0.13)+4.2×3.74

10.32.52-(6+9.728÷3.2)×2.5

11.[(7.1-5.6)×0.9-1.15] ÷2.5

12.5.4÷[2.6×(3.7-2.9)+0.62]

13.12×6÷(12-7.2)-6

14.12×6÷7.2-6

15.33.02-(148.4-90.85)÷2.5

7×(5/21+9/714)

a^3-2b^3+ab(2a-b)

=a^3+2a^2b-2b^3-ab^2

=a^2(a+2b)-b^2(2b+a)

=(a+2b)(a^2-b^2)

=(a+2b)(a+b)(a-b)

2.

(x^2+y^2)^2-4y(x^2+y^2)+4y^2

=(x^2+y^2-2y)^2

3.

(x^2+2x)^2+3(x^2+2x)+x^2+2x+3

=(x^2+2x)^2+4(x^2+2x)+3

=(x^2+2x+3)(x^2+2x+1)

=(x^2+2x+3)(x+1)^2

4.

(a+1)(a+2)+(2a+1)(a-2)-12

=a^2+3a+2+2a^2-3a-2-12

=3a^2-12

=3(a+2)(a-2)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

写完一遍后再别这些题写一遍,以此类推,老师们看作业都是一看而过不会一个一个批的。

八年级的数学题和答案

一. 仔细选一选 (本题有10个小题, 每小题3分, 共30分)

1.下列各组数可能是一个三角形的边长的是

A. 1,2,4 B. 4,5,9 C. 4,6,8 D. 5,5,11

2.若x>y,则下列式子错误的是

A. x﹣1>y﹣1 B. ﹣3x>﹣3y C. x+1>y+1 D.

3.一副三角板如图叠放在一起,则图中∠α的度数为

A. 75° B. 60° C. 65° D. 55°

4.如图,△ABC中,AB=AC,∠A=36°,BD是AC边上的高,则∠DBC的度数是

A. 18° B. 24° C. 30° D. 36°

5.如图,在边长为1的正方形网格中,将△ABC先向右平移两个单位长度,再关于x轴对称得到△A′B′C′,则点B′的坐标是

A. (0,﹣1) B. (1,1) C. (2,﹣1) D. (1,﹣2)

6.如图,△ABC中,D为AB中点,E在AC上,且BE⊥AC.若DE=5,AE=8,则BE的长度是

A. 5 B. 5.5 C. 6 D. 6.5

7.一次函数y=mx+|m﹣1|的图象过点(0,2),且y随x的增大而增大,则m=

A. ﹣1 B. 3 C. 1 D. ﹣1或3

8.如图,已知△ABC中,∠ABC=45°,AC=4,H是高AD和BE的交点,则线段BH的长度为

A. B. 4 C. D. 5

9. 如图,在平面直角坐标系中,以O为圆心,适当长为半径画弧,交x轴于点M,交y轴于点N,再分别以点M、N为圆心,大于MN的长为半径画弧,两弧在第二象限交于点P.若点P的坐标为(2x,y+1),则y关于x的函数关系为

A. y=x B. y=-2x﹣1 C. y=2x﹣1 D. y=1-2x

10.如图,O是正△ABC内一点,OA=3,OB=4,OC=5,将线段BO以点B为旋转中心逆时针旋转60°得到线段BO′,下列结论:①△BO′A可以由△BOC绕点B逆时针旋转60°得到;②点O与O′的距离为4;③∠AOB=150°;④S四边形AOBO′=6+3;⑤S△AOC+S△AOB=6+.其中正确的结论是

A. ①②③⑤ B. ①③④ C. ②③④⑤ D. ①②⑤

二. 认真填一填 (本题有6个小题, 每小题4分, 共24分)

11.已知点A(m,3)与点B(2,n)关于y轴对称,则m= ,n= .

12. “直角三角形只有两个锐角”的逆命题是 ,该逆命题是一个 命题(填“真”或“假”)

13.已知关于x的不等式(1﹣a)x>2的解集为x<,则a的取值范围是 .

14.直线l1:y=k1x+b与直线l2:y=k2x+c在同一平面直角坐标系中的图象如图所示,则关于x的不等式k1x+b<k2x+c的解集为 .

15.如图,在Rt△ABC中,∠A=90°,∠ABC的平分线BD交AC于点D,AD=3,BC=10,则△BDC的面积是 .

16.如图,直线y=﹣x+8与x轴,y轴分别交于点A和B,M是OB上的一点,若将△ABM沿AM折叠,点B恰好落在x轴上的点B′处,则直线AM的解析式为 .

三. 全面答一答(本题有7个小题,共66分)

17.(本小题满分6分)

如图,AB=AC,请你添加一个条件,使△ABE≌△ACD,

你添加的条件是   ;

根据上述添加的条件证明△ABE≌△ACD .

18.(本小题满分8分)解下列不等式和不等式组

(1)2(x+1)>3x﹣4 (2)

19.(本小题满分8分)

如图,△ABC是边长为2的等边三角形,将△ABC沿直线BC向右平移,使点B与点C重合,得到△DCE,连接BD,交AC于点F.

(1)猜想AC与BD的位置关系,并证明你的结论;

(2)求线段BD的长.

20.(本小题满分10分)如图,有8×8的正方形网格,按要求操作并计算.

(1)在8×8的正方形网格中建立平面直角坐标系,使点A的坐标为(2,4),点B的坐标为(4,2);

(2)将点A向下平移5个单位,再关于y轴对称得到点C,

求点C坐标;

(3)画出三角形ABC,并求其面积.

21.(本小题满分10分)

某文具店准备拿出1000元全部用来购进甲、乙两种钢笔,若甲种钢笔每支10元,乙种钢笔每支5元,考虑顾客需求,要求购进乙种钢笔的数量不少于甲种钢笔数量的6倍,且甲种钢笔数量不少于20支.若设购进甲种钢笔x支.

(1)该文具店共有几种进货方案?

(2)若文具店销售每支甲种钢笔可获利润3元,销售每支乙种钢笔可获利润2元,在第(1)问的各种进货方案中,哪一种方案获利?利润是多少元?

22.(本小题满分12分)

如图,△ABC是边长为4cm的等边三角形,点P,Q分别从顶点A,B同时出发,沿线段AB,BC运动,且它们的速度都为1cm/s.当点P到达点B时,P、Q两点停止运动.设点P的运动时间为t(s),

(1)当t为何值时,△PBQ是直角三角形?

(2)连接AQ、CP,相交于点M,则点P,Q在运动的过程中,∠CMQ会变化吗?若变化,则说明理由;若不变,请求出它的度数.

23.(本小题满分12分)

如图,直线y=kx﹣3与x轴、y轴分别交于B、C两点,且.

(1)求点B坐标和k值;

(2)若点A(x,y)是直线y=kx﹣3上在第一象限内的一个动点,当点A在运动过程中,试写出△AOB的面积S与x的函数关系式(不要求写自变量范围);并进一步求出点A的坐标为多少时,△AOB的面积为;

(3)在上述条件下,x轴上是否存在点P,使△ABP为等腰三角形?若存在,请写出满足条件的所有P点坐标;若不存在,请说明理由.

选择题 (每题3分,共30分)

题号 1 2 3 4 5 6 7 8 9 10

答案 C B A A D C B B B A

二、填空题(每题4分,共24分)

11. -2 3 ; 12. 只有两个锐角的三角形是直角三角形 假 ;

13. a>1; 14. x< 1 ; 15. 15 16. y=﹣x+3

三.解答题(共66分)

17.(本小题满分6分)

解: (1) 添加的条件是∠B=∠C或AE=AD

(2)添加∠B=∠C或AE=AD后可分别根据ASA、SAS判定△ABE≌△ACD.

18.(本小题满分8分)

解 :(1) x< 6 (2)-0.5 < x< 2

19.(本小题满分8分)

解:(1)AC与BD的位置关系是:AC⊥BD.

∵△DCE由△ABC平移而成,

∴BE=2BC=4,DE=AC=2,∠E=∠ACB=60°,

∴DE=BE,

∴BD⊥DE,

又∵∠E=∠ACB=60°,

∴AC∥DE,

∴BD⊥AC,

∵△ABC是等边三角形,

∴BF是边AC的中线,

∴BD⊥AC,BD与AC互相垂直平分;

(2)∵由(1)知,AC∥DE,BD⊥AC,

∴△BED是直角三角形,

∵BE=4,DE=2,

∴BD==2.

20. (本小题满分10分)

解:(1)略

(2)点C(-2,-1)

(3)S=5×6—6×3÷2—4×5÷2—2×2÷2=9

21.(本小题满分10分)

解:(1)设购进甲钢笔x支,乙钢笔y支,根据题意可得:

10x+5y=1000

6x≤y

20≤x

解得:20≤x≤25,

∵x为整数,

∴x=20,21,22,23,24,25共六种方案,

∴该文具店共有6种进货方案;

(2)设利润为W元,则W=3x+2y,

∵10x+5y=1000,

∴y=200﹣2x,

∴代入上式得:W=400﹣x,

∵W随着x的增大而减小,

∴当x=20时,W有值,值为W=400﹣20=380(元).

22.(本小题满分12分)

解:(1)设时间为t,则AP=BQ=t,PB=4﹣t

①当∠PQB=90°时,

∵∠B=60°,

∴PB=2BQ,得4﹣t=2t,t=;

②当∠BPQ=90°时,

∵∠B=60°,

∴BQ=2BP,得t=2(4﹣t),t=;

∴当第秒或第秒时,△PBQ为直角三角形.

(2)∠CMQ=60°不变.

∵等边三角形中,AB=AC,∠B=∠CAP=60°

又由条件得AP=BQ,

∴△ABQ≌△CAP(SAS),

∴∠BAQ=∠ACP,

∴∠CMQ=∠ACP+∠CAM=∠BAQ+∠CAM=∠BAC=60°.

23.(本小题满分12分)

解:解:(1)在y=kx﹣3中,令x=0,则y=﹣3,故C的坐标是(0,﹣3),OC=3,

∵=,

∴OB=,则B的坐标是:(,0),

把B的坐标代入y=kx﹣3,得:k﹣3=0,解得:k=2;

(2)OB=,

则S=×(2x﹣3)=x﹣;

根据题意得:x﹣=,解得:x=3,则A的坐标是(3,3);

(3)

当O是△AOP的顶角顶点时,P的坐标是(﹣3,0)或(3,0);

当A是△AOP的顶角顶点时, P的坐标是(6,0);

当P是△AOP的顶角顶点时, P的坐标是(,0).

故P的坐标是:(﹣3,0)或(3,0)或(6,0)或(,0).

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初二地理下册期末考试试题

同学们为能在初二地理的期末考试中,取得优异的成绩,同学们要准备哪些期末试卷来复习呢?下面是我为大家带来的关于初二地理下册期末考试试题,希望会给大家带来帮助。

初二地理下册期末考试试题:

一、选择题:下列各题只有一个正确答案,请把正确答案的字母代号填在答题纸的表格中。(每小题2分,计30分)

1是某区域等高线示意,据回答1、2题。

1、中表示山脊的是

A.① B.②

C.③ D.④

2、中山顶⑤的高度可能是

A.550米 B.640米

C.740米 D.820米

3、关于亚洲的自然条件,下列叙述不正确的是

A.跨纬度最广的大洲 B.四面临大洋

C.地跨寒、温、热三带 D.面积最大、西部深入亚欧大陆内部

4、读2四个省区轮廓,判断下面说法中正确的是

A.①省的简称为黔 B.②省的行政中心是太原

C.③省在我国的最东部 D.④省的自然环境特点是“高、寒”

5、下列地点中,既位于北半球,又位于东半球的地点是

A.40°N、16°E B.30°N、161°E

C.20°S、120°E  D.80°N、159°W

读3,回答6~8题。

6、根据阿米尔的头饰,判断他信仰的宗教最可能是

A.__ B. 犹太教 C.佛教 D.伊斯兰教

7、阿米尔所描述的气候类型是

A.热带雨林气候 B.热带沙漠气候

C.温带季风气候 D.地中海气候

8、从阿米尔的描述中可以判断,他会来自

A.非洲南部 B.欧洲西部

C.赤道附近 D.非洲北部

9、我国南方、北方气温不同的根本原因是:

A.海陆位置不同 B.地势高低不同

C.纬度高低不同 D.地表形态不同

10、下列说法错误的是:

A.我国是一个海陆兼备的国家,东临太平洋

B.我国是一个统一的多民族国家,各民族分布具有大杂居、小聚居的特点

C.我国人口的突出特点是人口基数大,人口增长快

D.我国地形复杂多样,气候以温带大陆性气候为主

1l、下列地形区中位于第一级阶梯的是:

A.青藏高原 B.黄土高原 C.四川盆地 D.长江中下游平原

读下,完成12~13题。

12、该所示的景观,出现在黄河的

A.上游 B.中游 C.下游 D.源头

13、形成该所示的景观的主要原因是

A.黄河上游气候趋于干旱 B.河套平原大量引水灌溉

C.黄土高原水土流失严重 D.内蒙古草原严重沙漠化

14、我国林地主要分布在

A.湿润区 B.半湿润区 C.半干旱区 D.干旱区

15、以下关于我国气温和降水的说法,不正确的是

A.冬季南北温差不大          B.夏季全国大部分地区普遍高温

C.年降水量从东南沿海向西北内陆减少 D.降水主要集中在夏秋两季

二、综合题:(最后的答案写入答题纸,每空1分,共20分)

16、读右5回答下列问题:(8分)

(1)请在4中标出地球公转的方向

(2)写出中各点的节气

A.  B.

C.  D.

(3)地球运动到中 处时,徐州的正午太阳高度达到最大,白昼时间最 ,影子处于一年中最  (长/短)

17、读右6,回答问题:(6分)

(1)中m点的经纬度是 , 。

(2)写出中数字代表的水域名称

① 洋,② 洋。

(3)河流③冲积形成了世界上面积最大的平原,该平原属于 气候

18、读7长江水系略,回答下列问题:(6分)

(1)A是 (河流); B是 (城市)。

(2)长江水能资源主要集中在 垒 河段,位于该河段上我国最大的水利枢纽工程是 ,该水电站位于 省

(3)玉树位于我国四大地理区域中的 地区。

初二地理下册期末考试试题答案:

一、 选择题:下列各题只有一个正确答案,请把正确答案的字母代号填在

表格中。(每小题2分,计30分)

l 2 3 4 5 6 7 8 9 1O 11 17 13 14 15

A C B D A D B D C D A C C A A

二、综合题:(每空1分,共20分)

l6、(1)公转方向自西向东(逆时针)

(2) 冬至 春分 夏至   秋分 (顺序一定,不能颠倒)

(3)C 长 短

l7、(1)20°S,40°W

(2)大西洋 太平洋

(3)亚马孙平原 热带雨林气候

18、(1)汉江;上海

(2)上游 三峡水利枢纽 湖北省

(3)青藏地区

看过初二地理下册期末考试试题的还看了:

1. 新人教版八年级地理下册期末试卷及答案

2. 2016八下地理期末试卷及答案

3. 八年级下册期末地理测试题及答案

4. 2016年八年级下册地理期末试卷及答案

八年级英语下册冀教版期末试题

八年级 英语期末考试与学生的学习是息息相关的。下面是我为大家整编的八年级英语下册冀教版期末试题,感谢欣赏。

八年级英语下册冀教版期末测试题

(满分100分)

一. 单项选择 (15分)

( ) 1. — What’s the     of your country, Tim?

— More than thirty-five million.

A. value B. name

C. advantage D. population

( ) 2. — Why not c onsider     the Internet for interesting information?

— Good idea!

A. search B. searches

C. searched D. searching

( ) 3. It was     of you to fight against the robber (抢劫者) just now. We’re all proud of you.

A. brave B. foolish

C. crazy D. pleasant

( ) 4. The writer     in translating this book into Chinese last month.

A. succeeded B. created

C. divided D. appeared

( ) 5. Tina has lived in China for two years, and she knows     Chinese.

A. a little of B. a little

C. a bit of D. both B and C

( ) 6. Mark didn’t wake up     his friend called him this morning.

A. before B. while

C. until D. after

( ) 7. Jack     the empty bottle on the floor and threw it into the dustbin.

A. opened up B. picked up

C. rang up D. moved up

( ) 8.     Jenny     I believe Tom’s words, because he always tells lies.

A. Either; or B. Neither; nor

C. Both; and D. Not only; but also

( ) 9. The boy’s parents     s ince he was three years old. He has to live with his grandparents.

A. died B. dead

C. were dying D. have been dead

( )10. It’s difficult     the poor man     that new house.

A. for; afford B. of; afford

C. for; to afford D. of; to afford

( )11. Judy seldom goes to the history museum,     she?

A. is B. isn’t

C. does D. doesn’t

( )12. My friend told me that she     for Shanghai on June 5th.

A. leave B. leaves

C. will leave D. would leave

( )13. — Where is your mother, Kim?

— She     Hangzhou. She’ll come back this weekend.

A. goes to B. has gone to

C. will go to D. has been to

( )14. If you drive too fast on the road, it     an accident.

A. cause B. causes

C. caused D. will cause

( )15. — Do you know    , Li Ming?

— Of course! In 2012.

A. where were the 30th Olympic Games held

B. when London hosted the 30th Olympic Games

C. which record was broken at the Olympic Games

D. how many medals did they get at the Olympic Games

二. 完形填空(10分)

Winter becomes colder and colder. People begin to wear more  16  themselves against the cold. But  17  do animals get through the long cold winter?

A number of animals, especially birds, travel to  18  places to get away from the cold. Wild geese, for example, fly south. Other animals, such as bears, snakes and squirrels,  19  most of their time eating or storing food. After enough food and energy preparation, they go to safe places to hibernate (冬眠).

Hibernation is a special and deep sleep. When animals hibernate, their body temperature drops, and their heart beat and breathing become very  20 . They look like dead ones. The largest hibernators are bears.  21  other hibernators, bears do not eat or drink while hibernating, which can last as  22  as six months.

For some cold-blooded animals,  23  gives them a good place to keep warm.  24  the weather gets cold, they move to the bottom of lakes or ponds. For insects (昆虫), most of them don’t  25  during the winter, which is called diapause (昆虫生 长的停滞期).

( )16. A. protect B. protecting

C. protects D. to protect

( )17. A. how B. what

C. where D. why

( )18. A. cooler B. warmer

C. colder D. windier

( )19. A. cost B. spend

C. take D. pay

( )20. A. quick B. strong

C. slow D. noisy

( )21. A. Instead B. Except

C. Unlike D. Without

( )22. A. long B. much

C. many D. far

( )23. A. land B. water

C. air D. space

( )24. A. Since B. When

C. For D. Even

( )25. A. sleep B. talk

C. grow D. stop

三. 阅读理解 (20分)

Zac, a first-grade student, was diagnosed (诊断) with cancer last June. He is undergoing treatment (进行治疗) but still goes to school every day, because at school he can play with Vincent. Five-year-old Vincent found out his best friend was sick, and he wanted to do everything he could to help. He wanted to show his friend that he was always with him.

When he learned Zac would lose his hair from chemotherapy (化疗), Vincent decided to shave his head. When the little boy was asked why he did that, he said, “I want to make Zac feel like he is not the only one without any hair.”

Vincent has also been learning about cancer and raising money for his best friend Zac after learning how expensive his chemotherapy is. He made more than 20 scarves and sold them. He raised more than $200 in total.

Zac’s mum is thankful that her son has such an amazing friend.

When he was asked what friendship was, Vincent looked at his friend Zac and answered, “It’s a beautiful thing.”

根据材料内容选择最佳答案,并将其标号填入题前括号内。

( )26. What happened to Zac?

A. He lost his left leg.

B. He was sick.

C. He was hurt badly.

D. He lost his family.

( )27. What does the underlined word “shave” mean in Chinese?

A. 剃光 B. 剪短 C. 染 D. 烫

( )28. To help Zac, Vincent raised money by    .

A. cutting off his hair and selling it

B. selling cookies after school

C. making scarves and selling them

D. asking other people for help

( )29. Which of the following is TRUE according to the passage?

A. Vincent has raised $100 so far.

B. Zac feels very lonely at school.

C. Zac has a truly good friend Vincent.

D. Vincent made more than 20 0 scarves.

( )30. The passage is mainly about    .

A. honesty B. courage C. ambition D. friendship

Tigers are the largest wild cats in the world. They usually go out to hunt for food when it is dark. And they hunt alone most of time. When a tiger sees an animal, it moves quickly and then jumps on the animals to kill it. Sometimes it can take the tiger several days to finish eating its food. When the tiger is full, it will cover the dead animal with leaves. Later, when the tiger is hungry again, it comes back to eat some more.

Tigers are different from others in the cat family: they like water and often jump into rivers to swim. Some tigers live in very cold places in North Korea, Russia and China. Other tigers live in warmer places—in India and parts of Southeast Asia.

But now all tigers are in danger. Some people kill tigers to use their skins for clothes, and their bodies for medicine. There is also less and less land for tigers to live in.

根据短文内容,选择正确答案。

( )31. The     is the largest wild cat in the world.

A. lion B. tiger

C. panda D. bear

( )32. Tigers like    , which is different from others in the cat family.

A. eating meat B. drinking water

C. swimming D. climbing trees

( )33. Tigers mainly live in    .

A. Asia B. Europe

C. Africa D. America

( )34. Tigers are in danger now because    .

A. s ome people kill them

B. the weather becomes warmer

C. they have less land to live in

D. both A and C

( )35. Which of the following is NOT true?

A. Tigers usually go out to look for food at night.

B. The tiger can kill a big animal very quickly.

C. The tiger covers the dead animal with leaves if it can’t eat it up.

D. Tigers like to hunt for food in small groups.

四. 词语运用(10分)

A. 根据句意及汉语提示写单词。

36. When did they       (发明) this new machine?

37. Emily is very good at       (地理), but I’m not.

38. He is a       (英雄) in the eyes of the public.

39. Please add half a       (匙) of sugar to my coffee.

40. Harry is traveling in the desert on his       (骆驼).

B. 从方框中选择恰当的单词或 短语 ,并用其正确形式填空。

twenty cover pollute danger stand out

41. Look! All the tables are      with newspapers now.

42. It’s very      to skate on the thin ice!

43. It was my sister’s      birthday. She invited many friends.

44. Emily’s red hat made her      in the crowd.

45.      has become a serious problem in the world now.

五. 连词成句(5分)

46. all, hand, they, the, by, made, kites

__________________________________.

47. away, rubbish, you, the, did, throw

__________________________________?

48. the, don’t, your, sidewalk, car, by, park

__________________________________.

49. been, long, they, abroad, have, how

__________________________________?

50. had, work, she, said, the, she, finished

__________________________________.

六. 任务型阅读(10分)

Have you ever seen the film Traveling Birds?  51  They cross the way above rivers, fields, sea and grassland.  52

But you may not feel so good if you have learnt about bird flu (禽流感) from TV or on the Internet. Some governments (政府) had to kill chickens in their cities.  53  And nearly 8,500 birds died in Russia because of bird flu.

Chickens can get bird flu from the feces (粪便) of the passing birds.  54  But it’s much more difficult to control the birds in the sky.

Luckily, scientists have found a medicine for bird flu.  55  So bird flu is still a serious problem we must face.

根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺、内容完整,并将其标号填写在下面题号后的横线上。

A.I’m sure you will love the beautiful picture when you see the film.

B.A large number of chickens and even some people died in Asia.

C.But the virus (病毒) can change easily and quickly.

D.In the film, groups of birds fly high above the sky.

E.It’s not so difficult to control the chickens in cages or on farms.

51.      52.      53.      54.      55.

七. 短文填空(10分)

从下面方框中选择适当的单词并用其正确形式填空。

hear twenty cut name happy

fun send real r ead interest

Dear Joe,

I’m glad to write to you!It was my (56)      birthday yesterday. I got a beautiful dress from my parents. My sister gave me a lovely pet dog. It made me (57)      and I liked it very much. At the same time, thank you for (58)      me a great gift.

I love reading very much. Yesterday, I found that there was a (59)      picture in TIME (《时代周刊》). So I (60)      it out to send to you. I hope you’ll like it. Also I’ve just finished an (61)      book. It is(62)      The Bat-Poet (《蝙蝠诗人》). There are some poems (诗歌) in it. I (63)      enjoy it. If you’d like to read it, I’ll send it to you.

Summer holiday is coming soon. During the summer holiday, I am trying to finish (64)

three books. What’s your plan for the holiday? Hope to (65)      from you soon!

Yours,

Betty

八. 补全对话(10分)

从方框中选择恰当的 句子 补全对话。其中有两项多余。

A: (66)

B: I’m reading a book.

A: What is it about?

B: (67)

A: Could you tell me more about it?

B: Of course! (68)        For example, cars pollute the air seriously, so we should go to work on foot or by bike.

A: You’re right. (69)

B: We’d better not throw away rubbish everywhere and not use plastic bags.

A: Yes, I think the most important thing is to stop cutting down more trees.

A: I agree. (70)        It’s also a good way to protect the environment.

B: Environment is important to us. Everyone should do something fo r it.

A. It tells us to make less pollution.

B. What else can we do?

C. It is named Save the Animals.

D. What are you doing, Mark?

E. We should plant more trees every year.

F. What kind of books do you like?

G. It’s mainly about how to save our world.

九. 书面表达 (10分)

如今,网络为我们的学习和生活带来了许多便利,但任何事物都具有两面性,它也对我们产生了一些不利的影响。请以“Advantages and disadvantages of the Internet”为题阐述一下你的观点。5ykj.com

要求:

① 字迹工整,层次清晰;

② 语句通顺,语法正确;

③ 不少于70词(开头结尾已给出,不计入总词数)。

Advantages and disadvantages of the Internet

In the modern world, the Internet has come into our life. _______________________________

______________________________________________________________________________________________________________________________________________________________

In a word, the Internet brings us not only a lot of convenience but also troubles. As students, we should make good use of the Internet.

八年级英语下册冀教版期末试题参考答案

1-5 DDAAD 6-10 CBBDC 11-15 CDBDB

16-20 DABBC 21-25 CABBC 26-30 BACCD

31-35 BCADD

36. invent 37. geography 38. hero 39. spoon 40. camel

41. covered 42. dangerous 43. twentieth 44. stand out 45. Pollution

46. They made all the kites by hand

47. Did you throw away the rubbish

48. Don’t park your car by the sidewalk

49. How long have they been abroad

50. She said she had finished the work

51-55 DABEC

56. twentieth 57. happy 58. sending 59. funny 60. cut

61. interesting 62. named 63. really 64. reading 65. hear

66-70 DGABE

One possible version:

Advantages and disadvantages of the Internet

In the modern world, the Internet has come into our life. Lots of students use the Internet as a tool for their studies. They look up the meanings of new words and learn history or geography on the Internet. They also use the Internet to read news or send e-mails.

But every coin has two sides. Some students spend too much time playing online games and chatting with friends. They are not interested in their studies. At the same time, they become weaker and weaker in body.

In a word, the Internet brings us not only a lot of convenience but also troubles. As students, we should make good use of the Internet.

八年级英语下册冀教版期末试题相关 文章 :

1. 八年级英语下册期末试卷及答案

2. 初二下册英语期末试题

3. 冀教版八年级英语上册知识点

4. 人教版八年级英语下册期末测试题

5. 2016年初二英语下期末试题

初二数学真题

初二数学试题(上)   一、选择题(本大题共15小题,每小题4分,共60分)在每小题所给的4个选项中,只有一项是符合题目要求的.请将正确答案涂在答题纸上。   1.下列长 度的三条线段能组成三角形的是   A.1,2,3 B.1, ,3 C.3,4,8 D.4,5,6   2.下面四个图形分别是节能、节水、低碳和绿色食品标志,在这四个标志中,是轴对称图形的是   A. B. C. D.   3.下列运算正确的是   A. B. C. D.   4.用长方形纸片折出直角的平分线,下列折法正确的是   A. B. C. D.   5.化简 的结果是   A. B. C. D.   6.如图,在△ABC中,∠B、∠C的平分线BE,CD相交于点F,∠ABC=42°,∠A=60°,则∠BFC=   A.118° B.119° C.120° D.121°   7.如图,在△ABC中,AB=AC,∠BAC=100°,AB的垂直平分线DE分别交AB、BC 于点D、E,则∠BAE=   A.80° B.60° C.50° D.40°   8.如图,等腰三角形ABC中,AB=AC,BD平分∠ABC,∠A=36°,则∠1的度数为   A.36° B.60° C.72° D.108°   9.在平面直角坐标系中,点(4,﹣5)关于x轴对称点的坐标为   A.(4,5) B.(﹣4,﹣5) C.(﹣4,5) D.(5,4)   10.请你计算:(1﹣x)(1+x),   (1﹣x)(1+x+x2),…,   猜想:(1﹣x)(1+x+x2+…+xn)的结果是   A. 1﹣xn+1 B. 1+xn+1 C. 1﹣xn D. 1+xn   11.在边长为a的正方形中挖去一个边长为b的小正方形(a>b)(如图甲),把余下的部分拼成一个矩形(如图乙),根据两个图形中阴影部分的面积相等,可以验证   A. (a+b)2=a2+2ab+b2 B. (a﹣b)2=a2-2ab+b2   C. (a+b)(a﹣b)= a2﹣b2 D. (a+2b)(a﹣b)=a2+ab﹣2b2   12. 下列变形正确的是   A. B. C. D.   13. 下列计算中,不正确的是   A. B.   C. D.   14. 已知 , ,则   A.4 B.3 C.12 D.1   15. 一项工程,甲单独做要x天完成,乙单独做要y天完成,则甲、乙合做完成工程需要的天数为   A. B. C. D.   二、填空题(本大题共4小题,每小题5分,共20分).   16. 因式分解: ____________________.   17. 分式方程 的解是__________.   18. 如图,将长方形ABCD沿AE折叠,得到如图的图形.已 知∠CEB′=50°,则∠AEB′的度数为________.   19. 如图,将一副直角三角板叠在一起,使直角顶点重合于点O,若∠DOC=28°,则∠AOB的度数为   .   三、解答题 (共20分)   20. (满分8分) 某市为治理污水,需要铺设一段全长为300米的污水排放管道.铺设120米后,为了尽量减少施工对城市所造成的影响,后来每天铺设管道的长度比原计划增加20%,结果共用30天完成这一任务.求后来每天铺设管道的长度.   21. (满分12分) 在△ABC中,AB=AC,点D是直线BC上一点(不与B、C重合),以AD为一边在AD的右侧作 △ADE,使AD=AE,∠DAE=∠BAC,连接CE.   (1)如图1,当点D在线段BC上,如果∠BAC=90°,求∠BCE的 度数;   (2)设∠BAC=α,∠BCE=β.   ①如图2,当点D在线段BC上移动,则α,β之间有怎样的数量关系?请说明理由;   ②当点D在直线BC上移动,则α,β之间有怎样的数量关系?请直接写出你的结论.

初二数学试题(下)   一.选择题   1.下列各式不是最简二次根式的是( )   A. B. C. D.   2.下 列根式中,与 是同类二次根式的是( )   A. B. C. D.   3. △ABC中∠A、∠B、∠C的对边分别是a、b、c,下列命题中的假命题是( )   A.如果∠C-∠B=∠A,则△ABC是直角三角形。   B.如果c2= b2—a2,则△ABC是直角三角形,且∠C=90°。   C.如果(c+a)(c-a)=b2,则△ABC是直角三角形。   D.如果∠A:∠B:∠C=5:2:3,则△ABC是直角三角形。   4. 下列命题的逆命题是真命题的个数为( )   (1)对顶角相等;(2)等腰三角形的两个底角相等;(3)三组边分别相等的两个三角形全等.   A.0个 B.1个 C.2个 D.3个   5.一个直角三角形,有两边长分别为6和8,下列说法正确的是( )   A.第三边为 B.三角形的周长为25   C.三角形的面积为48 D.第三边可能为10   6.顺次连结四边形四条边的中点,所得的四边形是矩形,则原四边形一定是( )   A.平行四边形 B. 对角线相等的四边形 C. 矩形 D. 对角线互相垂直的四边形   7. 已知一个菱形的周长是20cm,两条对角线的比是4∶3,则这个菱形的`面积是( )   A.12cm2 B. 24cm2 C. 48cm2 D. 96cm2   8. 若 , ,则 ( )   A. B. C. D.   9.下列四个说法:   ①一组对角相等,一组邻角互补的四边形是平行四边形;   ②一组对边平行,另一组对边相等的四边形是平行四边形;   ③一组对边平行,一组对角相等的四边形是平行四边形;   ④一组对边相等,一组对角相等的四边形是平行四边形;其中说法正确的个数是( )   A.1个 B.2个 C.3个 D.4个   10. 如图,D是△ABC内一点,BD⊥CD,AD=6,BD=4,CD=3,E、F、G、H分别是AB、AC、CD、BD的中点,则四边形EFGH的周长是( ) ①5√8-2√32+√50

=5*3√2-2*4√2+5√2

=√2(15-8+5)

=12√2

②√6-√3/2-√2/3

=√6-√6/2-√6/3

=√6/6

③(√45+√27)-(√4/3+√125)

=(3√5+3√3)-(2√3/3+5√5)

=-2√5+7√5/3

④(√4a-√50b)-2(√b/2+√9a)

=(2√a-5√2b)-2(√2b/2+3√a)

=-4√a-6√2b

⑤√4x*(√3x/2-√x/6)

=2√x(√6x/2-√6x/6)

=2√x*(√6x/3)

=2/3*|x|*√6

⑥(x√y-y√x)÷√xy

=x√y÷√xy-y√x÷√xy

=√x-√y

⑦(3√7+2√3)(2√3-3√7)

=(2√3)^2-(3√7)^2

=12-63

=-51

⑧(√32-3√3)(4√2+√27)

=(4√2-3√3)(4√2+3√3)

=(4√2)^2-(3√3)^2

=32-27

=5

⑨(3√6-√4)?

=(3√6)^2-2*3√6*√4+(√4)^2

=54-12√6+4

=58-12√6

⑩(1+√2-√3)(1-√2+√3)

=[1+(√2-√3)][1-(√2-√3)]

=1-(√2-√3)^2

=1-(2+3+2√6)

=-4-2√6

(1)5√12×√18

=5*2√3*3√2

=30√6;

(2)-6√45×(-4√48)

=6*3√5*4*4√3

=288√15;

(3)√(12a)×√(3a) /4

=√(36a^2)/4

=6a/4

=3a/2.

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

有理数练习

练习一(B级)

(一)计算题:

(1)23+(-73) (2)(-84)+(-49) (3)7+(-2.04) (4)4.23+(-7.57) (5)(-7/3)+(-7/6) (6)9/4+(-3/2) (7)3.75+(2.25)+5/4 (8)-3.75+(+5/4)+(-1.5)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

9.

9x^2(x-1)^2-3(x^2-x)-56

=9x^2(x-1)^2-3x(x-1)-56

=[3x(x-1)-8][3x(x-1)+7]

=(3x^2-3x-8)(3x^2-3x+7)

1.125*3+125*5+25*3+25

2.9999*3+101*11*(101-92)

3.(23/4-3/4)*(3*6+2)

4. 3/7 × 49/9 - 4/3

5. 8/9 × 15/36 + 1/27

6. 12× 5/6 – 2/9 ×3

7. 8× 5/4 + 1/4

8. 6÷ 3/8 – 3/8 ÷6

9. 4/7 × 5/9 + 3/7 × 5/9

10. 5/2 -( 3/2 + 4/5 )

11. 7/8 + ( 1/8 + 1/9 )

12. 9 × 5/6 + 5/6

13. 3/4 × 8/9 - 1/3

14. 7 × 5/49 + 3/14

15. 6 ×( 1/2 + 2/3 )

16. 8 × 4/5 + 8 × 11/5

17. 31 × 5/6 – 5/6

18. 9/7 - ( 2/7 – 10/21 )

19. 5/9 × 18 – 14 × 2/7

20. 4/5 × 25/16 + 2/3 × 3/4

21. 14 × 8/7 – 5/6 × 12/15

22. 17/32 – 3/4 × 9/24

23. 3 × 2/9 + 1/3

24. 5/7 × 3/25 + 3/7

25. 3/14 ×× 2/3 + 1/6

26. 1/5 × 2/3 + 5/6

27. 9/22 + 1/11 ÷ 1/2

28. 5/3 × 11/5 + 4/3

29. 45 × 2/3 + 1/3 × 15

30. 7/19 + 12/19 × 5/6

31. 1/4 + 3/4 ÷ 2/3

32. 8/7 × 21/16 + 1/2

33. 101 × 1/5 – 1/5 × 21

34.50+160÷40

35.120-144÷18+35

36.347+45×2-4160÷52

37(58+37)÷(64-9×5)

38.95÷(64-45)

39.178-145÷5×6+42

40.812-700÷(9+31×11)

41.85+14×(14+208÷26)

43.120-36×4÷18+35

44.(58+37)÷(64-9×5)

45.(6.8-6.8×0.55)÷8.5

46.0.12× 4.8÷0.12×4.8

47.(3.2×1.5+2.5)÷1.6

48.6-1.6÷4= 5.38+7.85-5.37=

49.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

50.6.5×(4.8-1.2×4)=

51.5.8×(3.87-0.13)+4.2×3.74

52.32.52-(6+9.728÷3.2)×2.5

53.[(7.1-5.6)×0.9-1.15] ÷2.5

54.5.4÷[2.6×(3.7-2.9)+0.62]

55.12×6÷(12-7.2)-6

56.12×6÷7.2-6

57.0.68×1.9+0.32×1.9

58.58+370)÷(64-45)

59.420+580-64×21÷28

60.136+6×(65-345÷23)

15-10.75×0.4-5.7

62.18.1+(3-0.299÷0.23)×1

63.(6.8-6.8×0.55)÷8.5

64.0.12× 4.8÷0.12×4.8

65.(3.2×1.5+2.5)÷1.6

66.3.2×6+(1.5+2.5)÷1.6

67.0.68×1.9+0.32×1.9

68.10.15-10.75×0.4-5.7

69.5.8×(3.87-0.13)+4.2×3.74

70.32.52-(6+9.728÷3.2)×2.5

71.[(7.1-5.6)×0.9-1.15] ÷2.5

72.5.4÷[2.6×(3.7-2.9)+0.62]

73.12×6÷(12-7.2)-6

74.12×6÷7.2-6

75.33.02-(148.4-90.85)÷2.5

1) 76.(25%-695%-12%)*36

77./4*3/5+3/4*2/5

78.1-1/4+8/9/7/9

79.+1/6/3/24+2/21

80./15*3/5

81.3/4/9/10-1/6

82./3+1/2)/5/6-1/3]/1/7

83./5+3/5/2+3/4

84.(2-2/3/1/2)]*2/5

85.+5268.32-2569

86.3+456-52*8

87.5%+6325

88./2+1/3+1/4

2) 89+456-78

3) 5%+. 3/7 × 49/9 - 4/3

4) 9 × 15/36 + 1/27

5) 2× 5/6 – 2/9 ×3

6) 3× 5/4 + 1/4

7) 94÷ 3/8 – 3/8 ÷6

8) 95/7 × 5/9 + 3/7 × 5/9

9) 6/2 -( 3/2 + 4/5 )

10) 8 + ( 1/8 + 1/9 )

11) 8 × 5/6 + 5/6

12) 1/4 × 8/9 - 1/3

13) 10 × 5/49 + 3/14

14) 1.5 ×( 1/2 + 2/3 )

15) 2/9 × 4/5 + 8 × 11/5

16) 3.1 × 5/6 – 5/6

17) 4/7 - ( 2/7 – 10/21 )

18) 19 × 18 – 14 × 2/7

19) 5 × 25/16 + 2/3 × 3/4

20) 4 × 8/7 – 5/6 × 12/15

21) 7/32 – 3/4 × 9/24

22) 1、 2/3÷1/2-1/4×2/5

2、 2-6/13÷9/26-2/3

3、 2/9+1/2÷4/5+3/8

4、 10÷5/9+1/6×4

5、 1/2×2/5+9/10÷9/20

6、 5/9×3/10+2/7÷2/5

7、 1/2+1/4×4/5-1/8

8、 3/4×5/7×4/3-1/2

9、 23-8/9×1/27÷1/27

10、 8×5/6+2/5÷4

11、 1/2+3/4×5/12×4/5

12、 8/9×3/4-3/8÷3/4

13、 5/8÷5/4+3/23÷9/11

23) 1.2×2.5+0.8×2.5

24) 8.9×1.25-0.9×1.25

25) 12.5×7.4×0.8

26) 9.9×6.4-(2.5+0.24)(27) 6.5×9.5+6.5×0.5

0.35×1.6+0.35×3.4

0.25×8.6×4

6.72-3.28-1.72

0.45+6.37+4.55

5.4+6.9×3-(25-2.5)2×41846-620-380

4.8×46+4.8×54

0.8+0.8×2.5

1.25×3.6×8×2.5-12.5×2.4

28×12.5-12.5×20

23.65-(3.07+3.65)

(4+0.4×0.25)8×7×1.25

1.65×99+1.65

27.85-(7.85+3.4)

48×1.25+50×1.25×0.2×8

7.8×9.9+0.78

(1010+309+4+681+6)×12

3×9146×782×6×854

5.15×7/8+6.1-0.60625

1. 3/7 × 49/9 - 4/3

2. 8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4. 8× 5/4 + 1/4

5. 6÷ 3/8 – 3/8 ÷6

6. 4/7 × 5/9 + 3/7 × 5/9

7. 5/2 -( 3/2 + 4/5 )

8. 7/8 + ( 1/8 + 1/9 )

9. 9 × 5/6 + 5/6

10. 3/4 × 8/9 - 1/3

11. 7 × 5/49 + 3/14

12. 6 ×( 1/2 + 2/3 )

13. 8 × 4/5 + 8 × 11/5

14. 31 × 5/6 – 5/6

15. 9/7 - ( 2/7 – 10/21 )

16. 5/9 × 18 – 14 × 2/7

17. 4/5 × 25/16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/15

19. 17/32 – 3/4 × 9/24

20. 3 × 2/9 + 1/3

21. 5/7 × 3/25 + 3/7

22. 3/14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24. 9/22 + 1/11 ÷ 1/2

25. 5/3 × 11/5 + 4/3

26. 45 × 2/3 + 1/3 × 15

27. 7/19 + 12/19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29. 8/7 × 21/16 + 1/2

30. 101 × 1/5 – 1/5 × 21

31.50+160÷40 (58+370)÷(64-45)

32.120-144÷18+35

33.347+45×2-4160÷52

34(58+37)÷(64-9×5)

35.95÷(64-45)

36.178-145÷5×6+42 420+580-64×21÷28

37.812-700÷(9+31×11) (136+64)×(65-345÷23)

38.85+14×(14+208÷26)

39.(284+16)×(512-8208÷18)

40.120-36×4÷18+35

41.(58+37)÷(64-9×5)

42.(6.8-6.8×0.55)÷8.5

43.0.12× 4.8÷0.12×4.8

44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

45.6-1.6÷4= 5.38+7.85-5.37=

46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

48.10.15-10.75×0.4-5.7

49.5.8×(3.87-0.13)+4.2×3.74

50.32.52-(6+9.728÷3.2)×2.5

51.[(7.1-5.6)×0.9-1.15] ÷2.5

52.5.4÷[2.6×(3.7-2.9)+0.62]

53.12×6÷(12-7.2)-6 (4)12×6÷7.2-6

102×4.5

7.8×6.9+2.2×6.9

5.6×0.25

8×(20-1.25)

1)127+352+73+44 (2)89+276+135+33

(1)25+71+75+29 +88 (2)243+89+111+57

9405-2940÷28×21

920-1680÷40÷7

690+47×52-398

148+3328÷64-75

360×24÷32+730

2100-94+48×54

51+(2304-2042)×23

4215+(4361-716)÷81

(247+18)×27÷25

36-720÷(360÷18)

1080÷(63-54)×80

(528+912)×5-6178

8528÷41×38-904

264+318-8280÷69

(174+209)×26- 9000

814-(278+322)÷15

1406+735×9÷45

3168-7828÷38+504

796-5040÷(630÷7)

285+(3000-372)÷36

1+5/6-19/12

3x(-9)+7x(-9

(-54)x1/6x(-1/3)

1.18.1+(3-0.299÷0.23)×1

2.(6.8-6.8×0.55)÷8.5

3.0.12× 4.8÷0.12×4.8

4.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

5.6-1.6÷4= 5.38+7.85-5.37=

6.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

7.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

8.10.15-10.75×0.4-5.7

9.5.8×(3.87-0.13)+4.2×3.74

10.32.52-(6+9.728÷3.2)×2.5

11.[(7.1-5.6)×0.9-1.15] ÷2.5

12.5.4÷[2.6×(3.7-2.9)+0.62]

13.12×6÷(12-7.2)-6

14.12×6÷7.2-6

15.33.02-(148.4-90.85)÷2.5

7×(5/21+9/714)

a^3-2b^3+ab(2a-b)

=a^3+2a^2b-2b^3-ab^2

=a^2(a+2b)-b^2(2b+a)

=(a+2b)(a^2-b^2)

=(a+2b)(a+b)(a-b)

2.

(x^2+y^2)^2-4y(x^2+y^2)+4y^2

=(x^2+y^2-2y)^2

3.

(x^2+2x)^2+3(x^2+2x)+x^2+2x+3

=(x^2+2x)^2+4(x^2+2x)+3

=(x^2+2x+3)(x^2+2x+1)

=(x^2+2x+3)(x+1)^2

4.

(a+1)(a+2)+(2a+1)(a-2)-12

=a^2+3a+2+2a^2-3a-2-12

=3a^2-12

=3(a+2)(a-2)

5.

x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2

=[x(y+z)-y(x-z)]^2

=(xz+yz)^2

=z^2(x+y)^2

6.

3(a+2)^2+28(a+2)-20

=[3(a+2)-2][(a+2)+10]

=(3a+4)(a+12)

7.

(a+b)^2-(b-c)^2+a^2-c^2

=(a+b)^2-c^2+a^2-(b-c)^2

=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)

=(a+b-c)(a+b+c+a-b+c)

=2(a+b-c)(a+c)

8.

x(x+1)(x^2+x-1)-2

=(x^2+x)(x^2+x-1)-2

=(x^2+x)^2-(x^2+x)-2

=(x^2+x-2)(x^2+x+1)

=(x+2)(x-1)(x^2+x+1)

写完一遍后再别这些题写一遍,以此类推,老师们看作业都是一看而过不会一个一个批的。

八年级的数学题和答案

一. 仔细选一选 (本题有10个小题, 每小题3分, 共30分)

1.下列各组数可能是一个三角形的边长的是

A. 1,2,4 B. 4,5,9 C. 4,6,8 D. 5,5,11

2.若x>y,则下列式子错误的是

A. x﹣1>y﹣1 B. ﹣3x>﹣3y C. x+1>y+1 D.

3.一副三角板如图叠放在一起,则图中∠α的度数为

A. 75° B. 60° C. 65° D. 55°

4.如图,△ABC中,AB=AC,∠A=36°,BD是AC边上的高,则∠DBC的度数是

A. 18° B. 24° C. 30° D. 36°

5.如图,在边长为1的正方形网格中,将△ABC先向右平移两个单位长度,再关于x轴对称得到△A′B′C′,则点B′的坐标是

A. (0,﹣1) B. (1,1) C. (2,﹣1) D. (1,﹣2)

6.如图,△ABC中,D为AB中点,E在AC上,且BE⊥AC.若DE=5,AE=8,则BE的长度是

A. 5 B. 5.5 C. 6 D. 6.5

7.一次函数y=mx+|m﹣1|的图象过点(0,2),且y随x的增大而增大,则m=

A. ﹣1 B. 3 C. 1 D. ﹣1或3

8.如图,已知△ABC中,∠ABC=45°,AC=4,H是高AD和BE的交点,则线段BH的长度为

A. B. 4 C. D. 5

9. 如图,在平面直角坐标系中,以O为圆心,适当长为半径画弧,交x轴于点M,交y轴于点N,再分别以点M、N为圆心,大于MN的长为半径画弧,两弧在第二象限交于点P.若点P的坐标为(2x,y+1),则y关于x的函数关系为

A. y=x B. y=-2x﹣1 C. y=2x﹣1 D. y=1-2x

10.如图,O是正△ABC内一点,OA=3,OB=4,OC=5,将线段BO以点B为旋转中心逆时针旋转60°得到线段BO′,下列结论:①△BO′A可以由△BOC绕点B逆时针旋转60°得到;②点O与O′的距离为4;③∠AOB=150°;④S四边形AOBO′=6+3;⑤S△AOC+S△AOB=6+.其中正确的结论是

A. ①②③⑤ B. ①③④ C. ②③④⑤ D. ①②⑤

二. 认真填一填 (本题有6个小题, 每小题4分, 共24分)

11.已知点A(m,3)与点B(2,n)关于y轴对称,则m= ,n= .

12. “直角三角形只有两个锐角”的逆命题是 ,该逆命题是一个 命题(填“真”或“假”)

13.已知关于x的不等式(1﹣a)x>2的解集为x<,则a的取值范围是 .

14.直线l1:y=k1x+b与直线l2:y=k2x+c在同一平面直角坐标系中的图象如图所示,则关于x的不等式k1x+b<k2x+c的解集为 .

15.如图,在Rt△ABC中,∠A=90°,∠ABC的平分线BD交AC于点D,AD=3,BC=10,则△BDC的面积是 .

16.如图,直线y=﹣x+8与x轴,y轴分别交于点A和B,M是OB上的一点,若将△ABM沿AM折叠,点B恰好落在x轴上的点B′处,则直线AM的解析式为 .

三. 全面答一答(本题有7个小题,共66分)

17.(本小题满分6分)

如图,AB=AC,请你添加一个条件,使△ABE≌△ACD,

你添加的条件是   ;

根据上述添加的条件证明△ABE≌△ACD .

18.(本小题满分8分)解下列不等式和不等式组

(1)2(x+1)>3x﹣4 (2)

19.(本小题满分8分)

如图,△ABC是边长为2的等边三角形,将△ABC沿直线BC向右平移,使点B与点C重合,得到△DCE,连接BD,交AC于点F.

(1)猜想AC与BD的位置关系,并证明你的结论;

(2)求线段BD的长.

20.(本小题满分10分)如图,有8×8的正方形网格,按要求操作并计算.

(1)在8×8的正方形网格中建立平面直角坐标系,使点A的坐标为(2,4),点B的坐标为(4,2);

(2)将点A向下平移5个单位,再关于y轴对称得到点C,

求点C坐标;

(3)画出三角形ABC,并求其面积.

21.(本小题满分10分)

某文具店准备拿出1000元全部用来购进甲、乙两种钢笔,若甲种钢笔每支10元,乙种钢笔每支5元,考虑顾客需求,要求购进乙种钢笔的数量不少于甲种钢笔数量的6倍,且甲种钢笔数量不少于20支.若设购进甲种钢笔x支.

(1)该文具店共有几种进货方案?

(2)若文具店销售每支甲种钢笔可获利润3元,销售每支乙种钢笔可获利润2元,在第(1)问的各种进货方案中,哪一种方案获利?利润是多少元?

22.(本小题满分12分)

如图,△ABC是边长为4cm的等边三角形,点P,Q分别从顶点A,B同时出发,沿线段AB,BC运动,且它们的速度都为1cm/s.当点P到达点B时,P、Q两点停止运动.设点P的运动时间为t(s),

(1)当t为何值时,△PBQ是直角三角形?

(2)连接AQ、CP,相交于点M,则点P,Q在运动的过程中,∠CMQ会变化吗?若变化,则说明理由;若不变,请求出它的度数.

23.(本小题满分12分)

如图,直线y=kx﹣3与x轴、y轴分别交于B、C两点,且.

(1)求点B坐标和k值;

(2)若点A(x,y)是直线y=kx﹣3上在第一象限内的一个动点,当点A在运动过程中,试写出△AOB的面积S与x的函数关系式(不要求写自变量范围);并进一步求出点A的坐标为多少时,△AOB的面积为;

(3)在上述条件下,x轴上是否存在点P,使△ABP为等腰三角形?若存在,请写出满足条件的所有P点坐标;若不存在,请说明理由.

选择题 (每题3分,共30分)

题号 1 2 3 4 5 6 7 8 9 10

答案 C B A A D C B B B A

二、填空题(每题4分,共24分)

11. -2 3 ; 12. 只有两个锐角的三角形是直角三角形 假 ;

13. a>1; 14. x< 1 ; 15. 15 16. y=﹣x+3

三.解答题(共66分)

17.(本小题满分6分)

解: (1) 添加的条件是∠B=∠C或AE=AD

(2)添加∠B=∠C或AE=AD后可分别根据ASA、SAS判定△ABE≌△ACD.

18.(本小题满分8分)

解 :(1) x< 6 (2)-0.5 < x< 2

19.(本小题满分8分)

解:(1)AC与BD的位置关系是:AC⊥BD.

∵△DCE由△ABC平移而成,

∴BE=2BC=4,DE=AC=2,∠E=∠ACB=60°,

∴DE=BE,

∴BD⊥DE,

又∵∠E=∠ACB=60°,

∴AC∥DE,

∴BD⊥AC,

∵△ABC是等边三角形,

∴BF是边AC的中线,

∴BD⊥AC,BD与AC互相垂直平分;

(2)∵由(1)知,AC∥DE,BD⊥AC,

∴△BED是直角三角形,

∵BE=4,DE=2,

∴BD==2.

20. (本小题满分10分)

解:(1)略

(2)点C(-2,-1)

(3)S=5×6—6×3÷2—4×5÷2—2×2÷2=9

21.(本小题满分10分)

解:(1)设购进甲钢笔x支,乙钢笔y支,根据题意可得:

10x+5y=1000

6x≤y

20≤x

解得:20≤x≤25,

∵x为整数,

∴x=20,21,22,23,24,25共六种方案,

∴该文具店共有6种进货方案;

(2)设利润为W元,则W=3x+2y,

∵10x+5y=1000,

∴y=200﹣2x,

∴代入上式得:W=400﹣x,

∵W随着x的增大而减小,

∴当x=20时,W有值,值为W=400﹣20=380(元).

22.(本小题满分12分)

解:(1)设时间为t,则AP=BQ=t,PB=4﹣t

①当∠PQB=90°时,

∵∠B=60°,

∴PB=2BQ,得4﹣t=2t,t=;

②当∠BPQ=90°时,

∵∠B=60°,

∴BQ=2BP,得t=2(4﹣t),t=;

∴当第秒或第秒时,△PBQ为直角三角形.

(2)∠CMQ=60°不变.

∵等边三角形中,AB=AC,∠B=∠CAP=60°

又由条件得AP=BQ,

∴△ABQ≌△CAP(SAS),

∴∠BAQ=∠ACP,

∴∠CMQ=∠ACP+∠CAM=∠BAQ+∠CAM=∠BAC=60°.

23.(本小题满分12分)

解:解:(1)在y=kx﹣3中,令x=0,则y=﹣3,故C的坐标是(0,﹣3),OC=3,

∵=,

∴OB=,则B的坐标是:(,0),

把B的坐标代入y=kx﹣3,得:k﹣3=0,解得:k=2;

(2)OB=,

则S=×(2x﹣3)=x﹣;

根据题意得:x﹣=,解得:x=3,则A的坐标是(3,3);

(3)

当O是△AOP的顶角顶点时,P的坐标是(﹣3,0)或(3,0);

当A是△AOP的顶角顶点时, P的坐标是(6,0);

当P是△AOP的顶角顶点时, P的坐标是(,0).

故P的坐标是:(﹣3,0)或(3,0)或(6,0)或(,0).

八年级下册卷子(初二数学真题)