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2017八年级上册历史作业本答案

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2017八年级上册历史作业本答案篇一

丹阳市2016-2017年八年级上英语第一次月度独立作业答案

八年级月度独立作业 英语试卷

(满分:150分 时间:120分钟)

第一部分 选择题(共80分)

一、听力(20分)

I.听对话,回答问题(10分)

本部分共有10道小题,每小题你将听到一段对话,每段对话听两遍。在听每段对话前,你有5秒钟的时间阅读题目;听完每段对话后,你将有5秒钟的时间选出你认为最合适的答案。请在听到―嘀‖的信号时,进入下一小题。

( )1. What’s the man doing now?

A. B. C.

( )2.What does the man want to learn?

A. B. C.

( )3. How does Henry go to school today?

A. B. C.

( )4. How will they go to the Summer Palace?

A. B. C.

( )5. When will they meet?

A. At 8:15 B. At 8: 45 C. At 9: 15

( )6. Where is the man going?

1

A. To the zoo B. To the post office C. To the park

( )7. Whose hair is the longest?

A. Leo’s B. John’s C. The woman’s

( )8.When will the train leave?

A. At 6:10 B. At 6: 20 C. At 6: 30

( )9.Why does the girl vote(投票) for Max?

A. Because he’s clever. B. Because he’s funny C. Because he’s handsome.

( )10.What does Mr. Smith like?

A. Tea and Beijing opera.

B. Tea and films.

C. Films and drink.

II.听对话和短文回答问题(10分)

你将听到一段对话和两篇短文,各听两遍。听每段对话和短文前,你将有时间阅读相关小题,每小题5秒钟;听完后,每小题你将有5秒钟的时间选出你认为最合适的答案。

听一段对话,回答第11—12小题。答题完毕,请等待―嘀‖的信号,进入第一篇短文。

( )11.Why does David like to be a reporter?

A. Because he likes to talk.

B. Because he likes to sing.

C. Because he likes to dance.

( )12.What does Helen want to be?

A. A teacher. B. A reporter. C. A doctor.

( )14. A. drawing B. swimming C. drinking water

( )15. A. factories B. the museum C. a market

听第二篇短文,回答第16—20小题。

( )16. How old is Peter?

A. 16 years old. B. 13years old C. 30 years old

( )17.What was he interested in?

A. Making more money. B. Finding a good job. C. Reading books.

( )18.Why did he want to look for a job?

A. Becuase he wanted to buy some books.

B. Because he wanted to make a lot of money.

C. Because he didn’t want to go to school.

2

2017八年级上册历史作业本答案篇二

江苏省丹阳市2016-2017年度八年级上英语第一次月度独立作业有答案

八年级月度独立作业{2017八年级上册历史作业本答案}.

英语试卷

(满分:150分 时间:120分钟)

第一部分 选择题(共80分)

一、听力(20分)

I.听对话,回答问题(10分)

本部分共有10道小题,每小题你将听到一段对话,每段对话听两遍。在听每段对话前,你有5秒钟的时间阅读题目;听完每段对话后,你将有5秒钟的时间选出你认为最合适的答案。请在听到―嘀‖的信号时,进入下一小题。

( )1. What’s the man doing now?

A. B. C.

( )2.What does the man want to learn?

A. B. C.

( )3. How does Henry go to school today?

A. B. C.

( )4. How will they go to the Summer Palace?

A. B. C.

( )5. When will they meet?

A. At 8:15 B. At 8: 45 C. At 9: 15

( )6. Where is the man going?

A. To the zoo B. To the post office C. To the park

( )7. Whose hair is the longest?

A. Leo’s B. John’s C. The woman’s

( )8.When will the train leave?

A. At 6:10 B. At 6: 20 C. At 6: 30

( )9.Why does the girl vote(投票) for Max?

A. Because he’s clever. B. Because he’s funny C. Because he’s handsome.

( )10.What does Mr. Smith like?

A. Tea and Beijing opera.

B. Tea and films.

C. Films and drink.

II.听对话和短文回答问题(10分)

你将听到一段对话和两篇短文,各听两遍。听每段对话和短文前,你将有时间阅读相关小题,每小题5秒钟;听完后,每小题你将有5秒钟的时间选出你认为最合适的答案。

听一段对话,回答第11—12小题。答题完毕,请等待―嘀‖的信号,进入第一篇短文。

( )11.Why does David like to be a reporter?

A. Because he likes to talk.

B. Because he likes to sing.

C. Because he likes to dance.

( )12.What does Helen want to be?

A. A teacher. B. A reporter. C. A doctor.

( )14. A. drawing B. swimming C. drinking water

( )15. A. factories B. the museum C. a market

听第二篇短文,回答第16—20小题。

( )16. How old is Peter?

A. 16 years old. B. 13years old C. 30 years old

( )17.What was he interested in?

A. Making more money. B. Finding a good job. C. Reading books.

( )18.Why did he want to look for a job?

A. Becuase he wanted to buy some books.

B. Because he wanted to make a lot of money.

{2017八年级上册历史作业本答案}.

C. Because he didn’t want to go to school.

( )19.What’s Peter’s first job?

A. To buy newspapers.

B. To send newspapers.

C. To sell newspapers.

( )20.Which of the following is TRUE?

A. Peter’s family was rich.

B. Peter could get only five dollars now.

C. Peter could get only three dollars now.

二、单项选择 (15分)

( ) 21. If we sit near ______ front of the bus, we’ll have ______ better view(风景).

A. / ; the B. / ; a C. the ; a D. the; the

( ) 22. The little girl kept ______ the house, because she wanted to keep it ______.

A. cleaning; clean B. cleaning; cleaning C. clean; clean D. clean; cleaning

( ) 23. -----When did they_______the village?

-------They_______this morning.

A.reach, arrived B.get to,arrived at

C.arrive in, reached D.arrive at, arrived

( ) 24.–Mum, can I have something________?

–Oh, dear. You can only drink some water. There is________ in the kitchen.

A. to drink; nothing else B. drinking; something else

C. to eat; something else D. eating; nothing else

( ) 25.Would you please _______ me _____ this weekend, Lily?

A. to help, to wash clothes B. to help, cook supper

C. help, with the cooking D. help, doing some cooking

( ) 26. ----The bus has stopped.Let’s_______.

----OK,be careful not to fall to the ground.

A .get on it B. get it on C. get off it D. get it off

( ) 27.Nanjing is bigger than ______ in Jiangsu and bigger than _______ in Chongqing.

A. any city; any city B. any city; any other city

C. any other city; the other cities D. any other city; any city

( ) 28.John has ___________free time than his parents so he is ________in his family.

A.less;busier B.fewer;the busiest C.less;the busiest D.fewer;busier

( ) 29. ______________it is!

A.what a hard work B.What a good music C.what good news D.what good song

( ) 30.My father usually __________morning papers before going to work.

A.looks through B.looks for C.looks after D.looks like

( ) 31. ---Hey, guys. Do you often have a good time ________ after-school activities? ---Of course, we do. And we always have a lot of time ________ soccer.

A. to do; to practice B. doing; practicing

C. to do; practicing D. doing; to practice

( )32. ------What's the _______ of the building? -It's 236 metres_______.

A. high; high B. height; height C. high; height D. height; high

( ) 33. The Changjiang River is _________ in China.

A. one of the long rivers B. longest river

C. one of long river D. one of the longest rivers

( ) 34.Lesson Two is ____ Lesson One. It’s much more difficult.

A. not so easy as B. easier than

C. as difficult as D. less difficult than

( ) 35.---Shall I give my seat to you as you look so tired?

---___________________.

A. Not too bad B. Not at all C. Do as you like D. It couldn’t be better

三、完形填空 (15分)

that night, a very tired Paolo said, ―I think Grandfather was old when he made his map. I don’t

think I’ll dig tomorrow.‖

Marcos smiled. ― Paola, it is all around you. You have enough food to make itthe winter, with plenty more to sell!‖ Paolo was embarrassed(尴尬的)His one day of hard work had provided(提供) him with real treasure. He learned an made his father proud.

( )36. A. feed B. help C. save D. watch ( )37. A. sad B. happy C. proud D. bored

( )38. A. stood up B. moved in C. started out D. stopped by ( )39. A. busy B. excited C. lazy D. free ( )40. A. use B. using C. to use D. used ( )41. A. how B. where C. when D. why ( )42. A. dug B. planted C. played D. arrived ( )43. A. got B. ate C. sang D. followed ( )44. A. listened B. returned C. talked D. led

( )45. A. quietly

( )46. A. everything

( )47. A. through

( )48. A. sure

( )49. A. plan

( )50. A. student

四、阅读理解。(30分) B. suddenly B. something B. without B. right B. meeting B. actor

C. sleepily C. anything C. since C. rich

C. lesson C. friend D. easily D. nothing D. before D. kind D. opinion D. farmer

( ) 51.Which book can tell you what to do if you are tired of a subject?

A. Study Skills for life B. Learning How to Learn

C. Basic Study Guidebook

D. How to Use a Dictionary Picture Book for Children

( ) 52.Many pictures in the book ―Learning how to learn‖ can ______.

A. make children read slowly

B. make children understand the book easily

C. make the book boring

D. make the children draw beautifully

( ) 53.According to the ads, the three books are for ______.

A. the old B. parents C. children D. men

( ) 54.If you buy the three book on December 2, you will just pay ___ for them.

A. $93 B. $71 C. $80 D. $79

( ) 55.The purpose of the three ads is to ______.

A. sell these books to children B. help children learn English

C. help children learn about nature

D. help children use a dictionary to pronounce correctly

2017八年级上册历史作业本答案篇三

江苏省扬州市2016-2017年度八年级上英语第一次月度独立作业有答案

八年级月度独立作业

英语试卷

(满分:150分 时间:120分钟)

第一部分 选择题(共80分)

一、听力(20分)

I.听对话,回答问题(10分)

本部分共有10道小题,每小题你将听到一段对话,每段对话听两遍。在听每段对话前,你有5秒钟的时间阅读题目;听完每段对话后,你将有5秒钟的时间选出你认为最合适的答案。请在听到―嘀‖的信号时,进入下一小题。

( )1. What’s the man doing now?

A. B. C.

( )2.What does the man want to learn?

A. B. C.

( )3. How does Henry go to school today?

A. B. C.

( )4. How will they go to the Summer Palace?

A. B. C.

( )5. When will they meet?

A. At 8:15 B. At 8: 45 C. At 9: 15

( )6. Where is the man going?{2017八年级上册历史作业本答案}.

A. To the zoo B. To the post office C. To the park

( )7. Whose hair is the longest?{2017八年级上册历史作业本答案}.

A. Leo’s B. John’s C. The woman’s

( )8.When will the train leave?

A. At 6:10 B. At 6: 20 C. At 6: 30

( )9.Why does the girl vote(投票) for Max?

A. Because he’s clever. B. Because he’s funny C. Because he’s handsome.

( )10.What does Mr. Smith like?

A. Tea and Beijing opera.

B. Tea and films.

C. Films and drink.

II.听对话和短文回答问题(10分)

你将听到一段对话和两篇短文,各听两遍。听每段对话和短文前,你将有时间阅读相关小题,每小题5秒钟;听完后,每小题你将有5秒钟的时间选出你认为最合适的答案。

听一段对话,回答第11—12小题。答题完毕,请等待―嘀‖的信号,进入第一篇短文。

( )11.Why does David like to be a reporter?

A. Because he likes to talk.

B. Because he likes to sing.

C. Because he likes to dance.

( )12.What does Helen want to be?{2017八年级上册历史作业本答案}.

A. A teacher. B. A reporter. C. A doctor.

( )14. A. drawing B. swimming C. drinking water

( )15. A. factories B. the museum C. a market

听第二篇短文,回答第16—20小题。

( )16. How old is Peter?

A. 16 years old. B. 13years old C. 30 years old

( )17.What was he interested in?

A. Making more money. B. Finding a good job. C. Reading books.

( )18.Why did he want to look for a job?

A. Becuase he wanted to buy some books.

B. Because he wanted to make a lot of money.

C. Because he didn’t want to go to school.

( )19.What’s Peter’s first job?

A. To buy newspapers.

B. To send newspapers.

C. To sell newspapers.

( )20.Which of the following is TRUE?

A. Peter’s family was rich.

B. Peter could get only five dollars now.

C. Peter could get only three dollars now.

二、单项选择 (15分)

( ) 21. If we sit near ______ front of the bus, we’ll have ______ better view(风景).

A. / ; the B. / ; a C. the ; a D. the; the

( ) 22. The little girl kept ______ the house, because she wanted to keep it ______.

A. cleaning; clean B. cleaning; cleaning C. clean; clean D. clean; cleaning

( ) 23. -----When did they_______the village?

-------They_______this morning.

A.reach, arrived B.get to,arrived at

C.arrive in, reached D.arrive at, arrived

( ) 24.–Mum, can I have something________?

–Oh, dear. You can only drink some water. There is________ in the kitchen.

A. to drink; nothing else B. drinking; something else

C. to eat; something else D. eating; nothing else

( ) 25.Would you please _______ me _____ this weekend, Lily?

A. to help, to wash clothes B. to help, cook supper

C. help, with the cooking D. help, doing some cooking

( ) 26. ----The bus has stopped.Let’s_______.

----OK,be careful not to fall to the ground.

A .get on it B. get it on C. get off it D. get it off

( ) 27.Nanjing is bigger than ______ in Jiangsu and bigger than _______ in Chongqing.

A. any city; any city B. any city; any other city

C. any other city; the other cities D. any other city; any city

{2017八年级上册历史作业本答案}.

( ) 28.John has ___________free time than his parents so he is ________in his family.

A.less;busier B.fewer;the busiest C.less;the busiest D.fewer;busier

( ) 29. ______________it is!

A.what a hard work B.What a good music C.what good news D.what good song

( ) 30.My father usually __________morning papers before going to work.{2017八年级上册历史作业本答案}.

A.looks through B.looks for C.looks after D.looks like

( ) 31. ---Hey, guys. Do you often have a good time ________ after-school activities? ---Of course, we do. And we always have a lot of time ________ soccer.

A. to do; to practice B. doing; practicing

C. to do; practicing D. doing; to practice

( )32. ------What's the _______ of the building? -It's 236 metres_______.

A. high; high B. height; height C. high; height D. height; high

( ) 33. The Changjiang River is _________ in China.

A. one of the long rivers B. longest river

C. one of long river D. one of the longest rivers

( ) 34.Lesson Two is ____ Lesson One. It’s much more difficult.

A. not so easy as B. easier than

C. as difficult as D. less difficult than

( ) 35.---Shall I give my seat to you as you look so tired?

---___________________.

A. Not too bad B. Not at all C. Do as you like D. It couldn’t be better

三、完形填空 (15分)

that night, a very tired Paolo said, ―I think Grandfather was old when he made his map. I don’t

think I’ll dig tomorrow.‖

Marcos smiled. ― Paola, it is all around you. You have enough food to make itthe winter, with plenty more to sell!‖ Paolo was embarrassed(尴尬的)His one day of hard work had provided(提供) him with real treasure. He learned an made his father proud.

( )36. A. feed B. help C. save D. watch ( )37. A. sad B. happy C. proud D. bored

( )38. A. stood up B. moved in C. started out D. stopped by ( )39. A. busy B. excited C. lazy D. free ( )40. A. use B. using C. to use D. used ( )41. A. how B. where C. when D. why ( )42. A. dug B. planted C. played D. arrived ( )43. A. got B. ate C. sang D. followed ( )44. A. listened B. returned C. talked D. led

( )45. A. quietly

( )46. A. everything

( )47. A. through

( )48. A. sure

( )49. A. plan

( )50. A. student

四、阅读理解。(30分) B. suddenly B. something B. without B. right B. meeting B. actor

C. sleepily C. anything C. since C. rich

C. lesson C. friend D. easily D. nothing D. before D. kind D. opinion D. farmer

( ) 51.Which book can tell you what to do if you are tired of a subject?

A. Study Skills for life B. Learning How to Learn

C. Basic Study Guidebook

D. How to Use a Dictionary Picture Book for Children

( ) 52.Many pictures in the book ―Learning how to learn‖ can ______.

A. make children read slowly

B. make children understand the book easily

C. make the book boring

D. make the children draw beautifully

( ) 53.According to the ads, the three books are for ______.

A. the old B. parents C. children D. men

( ) 54.If you buy the three book on December 2, you will just pay ___ for them.

A. $93 B. $71 C. $80 D. $79

( ) 55.The purpose of the three ads is to ______.

A. sell these books to children B. help children learn English

C. help children learn about nature

D. help children use a dictionary to pronounce correctly

2017八年级上册历史作业本答案篇四

人教版历史与社会七年级上册作业本答案

2017八年级上册历史作业本答案篇五

2017年八年级上数学寒假作业

八年级数学寒假作业(3)

一、选择题(本大题共10小题,每小题3分,共30分,在每小题给出的四个选项中,只有一项是符合题目要求的,把答案填在答题卷中) 1.下列实数中是无理数的是( ) A.0.38 B.

C.

D.﹣

2.在平面直角坐标系中,点P(5,﹣3)在( ) A.第一象限 B.第二象限 C.第三象限 D.第四象限 3.估计+3的值( )

A.在5和6之间 B.在6和7之间 C.在7和8之间 D.在8和9之间 4.在下列各组数据中,不能作为直角三角形的三边边长的是( ) A.3,4,6 B.7,24,25 C.6,8,10 D.9,12,15 5.下列各组数值是二元一次方程x﹣3y=4的解的是( ) A.

B.

C.

D.

A

.平均数

B.中位数 C.众数 D.平均数与众数 7.下列命题是真命题的是( ) A.两个锐角之和一定是钝角

2

B.如果x>0,那么x>0

C.两直线平行,同旁内角相等

D.平行于同一条直线的两条直线平行 8.下列各式中,运算正确的是( ) A.a6÷a3=a2 B.= C.(a3)2=a5 D.2+3=5

9.在平面直角坐标系中,已知一次函数y=kx+b的图象大致如图所示,则下列结论正确的是( )

A.k>0,b>0 B.k>0,b<0 C.k<0,b>0 D.k<0,b<0

10.如图,在△AOB中,∠B=20°,∠A=30°,将△AOB绕点O顺时针旋转60°,得到△A′OB′,边A′B′与边OB交于点C(A′不在OB上),则∠A′CO的度数为( ) A.70° B.80° C.90° D.100°

二、填空题(本大题共6小题,每小题4分,满分24分) 11.

=__________.

12.方程组的解是__________.

13.如图,字母A所代表的正方形的面积是__________.

13题 14题 16题

14.如图,BC⊥AE,垂足为C,过C作CD∥AB,若∠ECD=48°.则∠B=__________度. 15.点A(3,y1),B(﹣2,y2)都在直线y=﹣2x+3上,则y1与y2的大小关系是y1__________y2. 16.在一次“寻宝”游戏中,“寻宝”人找到了如图所示的两个标志点A(2,3)、B(4,1),已知AB两点到“宝藏”点的距离都是,则“宝藏”点的坐标是__________. 三、解答题(一)(本题3小题,每小题6分,共18分) 17.化简:

﹣3×

+

+(π+1)0

18.在如图的方格中,每个小正方形的边长都为1,△ABC的顶点均在格点上.在建立平面直角坐标系后,点B的坐标为(﹣1,2).

(1)把△ABC向下平移8个单位后得到对应的△A1B1C1,画出△A1B1C1,并写出A1坐标是__________.

(2)以原点O为对称中心,画出与△ABC关于原点O对称的△A2B2C2,并写出B2坐标是

__________.

19.某公司欲招聘策划人员一名,对A,B两名候选人进行了三项素质测试,他们的各项测试成绩如表所示:根据实际需要,公司将创新、综合和语言三项测试得分按4:3:1的比例确定两人的测试成绩,此时谁将被录用?

四、解答题(一)(本题3小题,每小题7分,共21分) 20.如图,小明将升旗的绳子拉到旗杆底端,并在绳子上打了一个结,然后将绳子拉到离旗杆底端5米处,发现此时绳子底端距离打结处约1米,请算出旗杆的高度.

21.医院用甲、乙两种原料为手术后的病人配制营养品,每克甲种原料含0.5单位的蛋白质和1单位铁质,每克乙种原料含0.7单位的蛋白质和0.4单位铁质.若病人每餐需要35单位的蛋白质和40单位铁质,那么每餐甲、乙两种原料各多少克恰能满足病人的需要?

22.请写出命题“等角的余角相等”的条件和结论;这个命题是真命题吗?如果是,请你证明;如果不是,请给出反例.

五、解答题(三)(本题3小题,每小题9分,共27分) 23.如图,已知:点P是△ABC内一点. (1)说明∠BPC>∠A;

(2)若PB平分∠ABC,PC平分∠ACB,∠A=40°,求∠P的度数.

24.如图,直线l1:y1=2x﹣1与直线l2:y2=x+2相交于点A,点P是x轴上任意一点,直线l3是经过点A和点P的一条直线. (1)求点A的坐标;

(2)直接写出当y1>y2时,x的取值范围;

(3)若直线l1,直线l3与x轴围成的三角形的面积为10,求点P的坐标.

25.如图,C为线段BD上一动点,分别过点B、D作AB⊥BD,ED⊥BD,连接AC、EC,已知AB=5,DE=1,BD=8,设CD=x

(1)用含x的代数式表示AC+CE的长;

(2)请问点C满足什么条件时,AC+CE的值最小? (3)根据(2)中的规律和结论,请构图求出代数式

+

的最小值.

八年级(上)数学寒假作业答案

一、选择题(本大题共10小题,每小题3分,共30分,在每小题给出的四个选项中,只有一项是符合题目要求的,把答案填在答题卷中) 1.下列实数中是无理数的是( ) A.0.38 B.

C.

D.﹣

【考点】无理数.

【分析】无理数就是无限不循环小数.理解无理数的概念,一定要同时理解有理数的概念,有理数是整数与分数的统称.即有限小数和无限循环小数是有理数,而无限不循环小数是无理数.由此即可判定选择项.

【解答】解:A、0.38是有理数,故A错误; B、C、D、﹣

是无理数,故B正确; 是有理数,故C错误; 是有理数,故D错误;

故选:B.

【点评】此题主要考查了无理数的定义,其中初中范围内学习的无理数有:π,2π等;开方开不尽的数;以及像0.1010010001…,等有这样规律的数.

2.在平面直角坐标系中,点P(5,﹣3)在( ) A.第一象限 B.第二象限 C.第三象限 D.第四象限 【考点】点的坐标.

【分析】根据各象限内点的坐标特征解答. 【解答】解:点P(5,﹣3)在第四象限. 故选D.

【点评】本题考查了各象限内点的坐标的符号特征,记住各象限内点的坐标的符号是解决的关键,四个象限的符号特点分别是:第一象限(+,+);第二象限(﹣,+);第三象限(﹣,﹣);第四象限(+,﹣).

3.估计+3的值( )

A.在5和6之间 B.在6和7之间 C.在7和8之间 D.在8和9之间 【考点】估算无理数的大小. 【专题】常规题型.

+3的近似值. 【分析】先估计的整数部分,然后即可判断

【解答】解:∵42=16,52=25, 所以,

+3在7到8之间. 所以

故选:C.

2017八年级上册历史作业本答案篇六

人教版 2016-2017年第一学期八年级上册初二数学期末考试模拟试卷有答案

八年级上册数学期末模拟试卷

1、平方根等于它本身的数是

A.0 B.1,0 C.0,1,-1 D.0,-1

2、下列各式中,正确的是

2A.如果x-9=0,则

2

22 3、点P关于x轴的对称点P1的坐标是(4,-8),则P点关于原点的对称点P2的坐标是

A.(-4,-8) B.(4,8) C.(-4,8)

D.(4,-8)

4、如图,已知AD=BC,要使得△ABD≌△CDB,需要添加的条件是

A.AB∥CD B. AD∥BC C.∠A= ∠C D. ∠CDA= ∠ABC

5、判断下列各组数据中,可以作为直角三角形的三条边的是

A.6,15,17 B.7,12,15 C.13,15,20 D.7,24,25

6、一支蜡烛的长20厘米,点燃后每小时燃烧5厘米,燃料时剩下的高度h(厘米)与燃烧时间t(时)的函数关系的图像是下图中的

( )

7、长城总长约6 700 010米,用科学记数法表示是(保留两个有效数字)( )

A.6.7×10 B. 6.7×10 C. 6.7×10 D. 6.7×10

8、已知一次函数y=kx+b的图象如图所示,则k,b的符号是( )

A. k>0,b>0 B. k>0,b<0

C. k<0,b>0 D. k<0,b<0

5678

二、耐心填一填(每小题3分,共24分)

9、若无理数a满足不等式1<a<4,请写出一个符合条件的无理数________。

10、点(11,y1),(2,y2 )是一次函数y=x-3图像上的两点,则y1 y2 。(填22

“>”、“=”或“<”)

11、已知△ABC≌△DEF,∠A=70°,∠E=30°,则∠F的度数为 __________。

12、作业本每个1.50元,试写出购作业本所需的经费y元与购作业本的个数x(个)之间的函数关系式 , 并计算出当x=20时,y= 。

{2017八年级上册历史作业本答案}.

13、如图,∠AOB=90°,∠B=30°, △A′OB′可以看作是由△AOB

绕点O顺时针旋转a角度得到的,若点A′在AB上,则旋转角a的

度数是___________.

14、函数y= 2x1的图像不经过象限。 3

15、在Rt

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