七年级数学上学期寒假作业答案(共10篇)
七年级数学上学期寒假作业答案 篇1
2018年七年级数学上学期寒假作业答案
为了保证孩子们过一个快乐的寒假充实的寒假,家长朋友们一定要监督孩子们的学习。查字典数学网初中频道为大家提供了七年级数学上学期寒假作业,希望大家认真阅读。
一、选择题(共10小题,每小题4分,满分40分,在每小题给出的选项中,只有一个符合题意,请将正确的一项代号填入下面括号内)
1.我县2018年12月21日至24日每天的最高气温与最低气温如下表:
日期 12月21日 12月22日 12月23日 12月24日
最高气温 8℃ 7℃ 5℃ 6℃
最低气温-3℃-5℃-4℃-2℃
其中温差最大的一天是 】
A.12月21日 B.12月22日 C.12月23日 D.12月24日
2.如图1所示,A,B两点在数轴上,点A对应的数为2.若线段AB的长为3,则点B对应的数为【 】
A.-1 B.-2 C.-3 D.-4
3.与算式 的运算结果相等的是【 】
A.B.C.D.4.化简 的结果是【 】
A.B.C.D.5.由四舍五入法得到的近似数,下列说法中正确的是【 】
A.精确到十分位,有2个有效数字 B.精确到个位,有2个有效数字
C.精确到百位,有2个有效数字 D.精确到千位,有4个有效数字 6.如下图,下列图形全部属于柱体的是 】
A B C D
7.如图2,一副三角板(直角顶点重合)摆放在桌面上,若AOD=150,则BOC等于【 】
A.30 B.45 C.50 D.60
图2 图3
8.如图3,下列说法中错误的是【 】
A.OA的方向是东北方向 B.OB的方向是北偏西60
C.OC的方向是南偏西60 D.OD的方向是南偏东60
9.为了解我县七年级6000名学生期中数学考试情况,从中抽取了500名学生的数学成绩进行统计.下列判断:①这种调查方式是抽样调查;②6000名学生是总体;③每名学生的数学成绩是个体;④500名学生是总体的一个样本;⑤500名学生是样本容量.其中正确的判断有【 】
A.1个 B.2个 C.3个 D.4个
10.如图4,宽为50cm的长方形图案由10个大小相等的小长方形拼成,其中一个小长方形的面积为【 】
A.4000cm2 B.600cm2 C.500cm2 D.400cm2
二、填空题(本大题共4小题,每小题5分,满分20分)
11.已知=361425,则的余角的度数是_________./P
12.王老师每晚19:00都要看央视的新闻联播节目,这一时刻钟面上时针与分针的夹角是 度.13.按下图所示的程序流程计算,若开始输入的值为,则最后输出的结果是____.14.已知线段AB=10cm,直线AB上有一点C,且BC=4cm,M是线段BC的中点,则AM的长是 cm.三、解答题(共90分)
15.计算下列各式(本题共2小题,每小题8分,共计16分)(1)(2)
16.先化简再求值(8分),其中,17.解方程组(本题共2小题,每小题8分,共计16分)
18.某生态示范园要对1号、2号、3号、4号四个品种共500株果树幼苗进行成活实验,从中选出成活率高的品种进行推广,通过实验得知,3号果树幼苗成活率为89.6%,把实验数据绘制成下列两幅统计图(部分信息未给出).4号25% 2号 3号25%
图1 图2
(1)实验所用的2号果树幼苗的数量是 株;
(2)请求出3号果树幼苗的成活数,并把图2的统计图补充完整;
(3)你认为应选哪一种品种进行推广?请通过计算说明理由.(8分)
19.小王家购买了一套经济适用房,他家准备将地面铺上地砖,地面结构如图所示.根据图中的数据(单位:m),解答下列问题:
(1)写出用含、的代数式表示地面总面积;
(2)已知客厅面积比卫生间面积多21m2,且地面总面积是卫生间面积的15倍,铺1m2地砖的平均费用为80元,求铺地砖的总费用为多少元?(10分)20.如图所示,已知O为AD上一点,AOC与AOB互补,OM、ON分别是AOC、AOB的平分线,若
MON=40,试求AOC与AOB的度数.(10分)
21.已知,如图,B,C两点把线段AD分成2∶5∶3三部分,M为AD的中点,BM=6cm,求CM和AD的长.(10分)
22.据电力部门统计,每天8:00至21:00是用电的高峰期,简称峰时,21:00至次日8:00是用电的低谷时期,简称谷时,为了缓解供电需求紧张矛盾,某市电力部门于本月初统一换装峰谷分时电表,对用电实行峰谷分时电价新政策,具体见下表:
时间 换表前 换表后
峰时(8:00~21:00)谷时(21:00~次日8:00)
电价 每度0.52元 每度0.55元 每度0.30元
(1)小张家上月峰时用电50度,谷时用电20度,若上月初换表,则相对于换表前小张家的电费是增多了还是减少了?增多或减少了多少元?请说明理由.(2)小张家这个月用电95度,经测算比换表前使用95度电节省了5.9元,问小张家这个月使用峰时电和谷时电分别是多少度?(12分)
一、选择题
题号 1 2 3 4 5 6 7 8 9 10
答案 B A A D C C A D B D
二、填空题
11.534535 12.150 13.231 14.8或12
三、解答题
15.(1)(2)
= 4分 = 4分 = 6分 = 6分
= 8分 =0 8分
16.(1)= 3分
因为,所以 6分
故 8分
17.(1)(2)
解:由②得 ③ 2分 解:由②得 ③ 2分
③-①得 ③-①得 4分
4分 将 代入①得 6分将 代入③得 6分
所以原方程组的解为 8分 所以原方程组的解为
分 8 18.(1)100 1分
(2)50025%89.6%=112(株)2分
统计图如图所示: 4分
(3)1号果树幼苗成活率为
2号果树幼苗成活率为
4号果树幼苗成活率为
因为93.6%89.6%85%
所以应选择4号品种进行推广 8分
19.(1)地面总面积为: m2 3分
(2)由题意,得 解得
6分 所以地面总面积为(m2)8分
因为铺1 m2地砖的平均费用为80元,所以铺地砖的总费用为:4580=3600(元)10分
20.因为OM、ON平分AOC和AOB,所以AOM= AOC,AON= AOB2分
所以MON=AOM-AON= AOC-AOB=40 4分
又因为AOC与AOB互补,所以AOC+AOB=180,6分
故可得方程组
8分
解得AOC=130,AOB=50 10分
21.解:设AB=2 cm,BC=5 cm,CD=3 cm
所以AD=AB+BC+CD=10 cm 2分 因为M是AD的中点,所以AM=MD= AB=5 cm
所以BM=AM-AB=5-2 =3 cm 6分
因为BM=6 cm,所以3 =6,=2 8分
故CM=MD-CD=5-3 =2 =22= 4cm,AD=10 =102=20 cm 10分
22.(1)换表前:0.52(50+20)=36.4(元)
换表后:0.5550+0.3020=33.5(元)
33.5-36.4=-2.9(元)
所以若上月初换表,则相对于换表前小张家的电费节省了2.9元.6分
(2)设小张家这个月使用峰时电是 度,则谷时电为(95-)度,由题意可得方程,解之得,95-60=35,即小张家这个月使用峰时电60度,谷时电35度.12分
新目标英语七年级(上)寒假作业 篇2
A) 根据句意及首字母提示,写出空白处所缺的单词。
1. December is the t______month of the year.
2. My father likes s_________. He can play baseball and soccer.
3. Yao Ming is a basketball s_________. We all like him.
4. Please w______to me and tell me about your family.
5. They work all n______every day,from 22:00 pm to 6:00 am.
B) 根据句意及汉语提示,写出空白处所缺的单词或短语。
1. The musician has two______(钢琴).
2. My brother often______(起床) at six o’clock in the morning.
3. You can______(打电话) me at 6881556.
4. We have sweaters for only 25 yuan;______(任何人) can afford this price.
5. Our P.E. teacher is very strict with us,and I’m usually very______(累) after class.
C) 用括号中所给动词的适当形式填空。
1. Can you______(play) the guitar for us?
2. Let’s go and______(see) Beijing Opera on weekends.
3. My sister______(not like) thrillers because they are very scary.
4. There______(be) some coffee in the glass.
5. She is always the last one______(get) to the school.
Ⅱ. 单项选择
1. Emma can play______violin,she can also play______volleyball.
A. the; the B. ×; the C. the; × D. a; a
2. —______is your birthday?
—It’s March 14th.
A. When B. What C. Where D. Who
3. He often______at 6:30______the morning.
A. have breakfast; in B. have the breakfast; on
C. has breakfast; in D. has the breakfast; on
4. Do you know______?
A. what is Linda’s job B. what does Linda do
C. what does Linda’s job is D. what Linda’s job is
5.______is between(在……之间) twelve and fourteen.
A. Ten B. Thirteen C. Fifteen D. Seventeen
6. We have great bags______sports______only 20 yuan.
A. at; for B. for; for C. for; in D. in; for
7. —Can I help you?
—_________.
A. Here you are B. Thanks a lot
C. You are welcome D. Yes,please
8. I like music,I want______the music club.
A. join B. to join C. joins D. to go
9. —_________. Is this your coat?
—No,it isn’t.
A. Sorry B. Thanks C. Excuse me D. OK
10. My son,please______these books to your brother. He’s at school now.
A. take B. bring C. want D. see
11. There are many______in the dish on the table.
A. food B. eggs C. pear D. milk
12. She is my sister,and______name is Kate.
A. her B. its C. his D. she
13. —______is your daughter?
—Seven.
A. How many B. How much C. How old D. How
14. I can dance,______I can’t dance well.
A. so B. or C. and D. but
15. —How much______these shorts?
—______two dollars.
A. are; It’s B. is; It’s C. are; They’re D. is; They’re
16. —What time do you go to school every morning?
—______7:15.
A. At B. On C. In D. From
17. —Who’s the boy in a yellow hat?
—_________.
A. I don’t know B. She is Tom’s friend
C. He is at school D. He is four
18. —Why don’t you like science?
—Because I think it’s______.
A. exciting B. funny C. boring D. interesting
19. —______is your Chinese teacher?
—Miss Yang.
A. How B. Who C. What D. Where
20. —Thank you very much.
—_________.
A. That’s right B. Right
C. You’re right D. That’s all right
Ⅲ. 句型转换 按括号内的要求改写下列句子,每空限填一词。
1. Jennifer does her homework at 6:30. (改为同义句)
Jennifer does her homework at____ _______ ______.
2. Jimmy does his homework every day. (改为一般疑问句)
______Jimmy______his homework every day?
3. Mr Black usually gets up at 5:30. (对画线部分提问)
______ ______ _____Mr Black usually_______ ________?
4. He is always late for school because he wants to sleep a litter longer. (对画线部分提问)
________ _______he always late for school?
5. She has breakfast at 7:00. (把主语She改为They)
________ _______breakfast at 7:00.
Ⅳ. 连词成句 根据横线后的标点符号,连词成句。
1. my,is,book,where,math
________________________________________________ ?
2. favorite,is,your,what,sport
________________________________________________ ?
3. at,has,Miss Barnes,usually,school,lunch
________________________________________________ .
4. fun,because,physical education,likes,she,it’s
________________________________________________ .
5. go,on,doesn’t,Kim,school,to,Sundays
________________________________________________ .
Ⅴ. 补全对话 根据对话内容,从方框中选择恰当的句子填空,完成对话。其中有两个句子是多余的。
A:Hi,Li Lei. __1__
B:I want to join the music club.
A:Oh. __2__
B:Yes,I can. I can sing well. __3__
A:No. __4__. I can play chess well.
B:I can play it,too.
A:Really? __5__
B:OK.
A. Can you play chess?
B. What club do you want to join?
C. Can you sing?
D. Do you want to join the music club?
E. Let’s sing a song.
F. I want to join the chess club.
G. Let’s play it now.
Ⅵ. 完形填空
Joe is an English boy. He is __1__ years old. He comes __2__ China with his parents. He is a student of Guangming Middle School of Beijing.
__3__ favorite subject is __4__. He thinks it is very __5__. But he __6__ speak Chinese well and he thinks it is difficult. He __7__ a Chinese club. He goes to __8__ club every day. And he goes to __9__ Chinese movies every Sunday. Then he can speak Chinese __10__.
1. A. thirty B. thirteen C. third D. three
2. A. to B. from C. for D. at
3. A. Her B. He C. His D. She
4. A. math B. Chinese C. English D. P.E
5. A. boring B. scary C. interesting D. busy
6. A. can B. not C. can’t D. don’t
7. A. wants B. joins C. likes D. helps
8. A. × B. a C. an D. the
9. A. paint B. learn C. look D. see
10. A. well B. also C. good D. nice
Ⅶ. 阅读理解
(A)
Mr White is from England. He is an English teacher now. His class is very interesting. He likes us and we like him,too. Mr White has two children,Tom and Lucy. Tom is seven and his sister is four. Tom goes to school but his sister doesn’t. Mr White likes to wear a T-shirt and jeans. Soccer is his favorite sport. After school we usually have a basketball match. Sometimes Mr White watches us play and sometimes he joins us. He plays basketball just for fun.
根据短文内容,从A,B,C,D中选择正确答案。
1. Mr White is______.
A. a Chinese teacher B. an English teacher
C. an English student D. a math teacher
2. How many daughters does Mr White have?
A. First. B. Two.C. Three. D. One.
3. Lucy doesn’t go to school because______.
A. she doesn’t want to go B. she doesn’t like school
C. she is too young D. her father doesn’t like her
4.______is Mr White’s favorite sport.
A. Volleyball B. Soccer C. Basketball D. Baseball
5. Which of the following is right?
A. After school we have a soccer match.
B. Sometimes Mr White watches our soccer match.
C. Sometimes Mr White joins us in our basketball match.
D. Mr White plays soccer just for fun.
(B)
根据表格中的内容,从A,B,C,D中选择正确答案。
6. How many English classes does Mary have in a week?
A. Two. B. Three. C. Four. D. Five.
7. Does Mary have classes at 10:30 am on Thursday?
A. Yes,she has. B. No,she doesn’t.
C. We don’t know. D. Yes,she has P.E..
8. When dose the football game start?
A. At 3:00 pm on Tuesday. B. At 2:00 pm on Thursday.
C. At 3:00 pm on Thursday. D. At 10:30 am on Tuesday.
9. Mary has a music class on______.
A. Monday afternoon B. Tuesday morning
C. Thursday afternoon D. Monday morning
10. —What does Mary do after English class on Friday?
—She______.
A. plays footballB. plays volleyball
C. goes to a movie D. plays the piano
Ⅷ. 书面表达
假设Maria是你的好朋友,她是一位英国女孩,今年11岁,她的生日是五月五日,最喜欢的运动是足球和网球,最喜欢的学科是数学,经常在周末去看电影。请你根据上面提供的信息,以“My Good Friend”为题写一篇50个词左右的英语短文。
Key:
Ⅰ. A) 1. twelfth 2. sports 3. star 4. write 5. night
B) 1. pianos 2. gets up 3. call/phone 4. anybody/anyone 5. tired
C) 1. play 2. see 3. doesn’t like 4. is 5. to get
Ⅱ. 1-5 CACDB 6-10 BDBCA 11-15 BACDC 16-20 AACBD
Ⅲ. 1. half,past,six 2. Does,do 3. What,time,does,get,up
4. Why,is 5. They,have
Ⅳ. 1. Where is my math book
2. What is your favorite sport
3. Miss Barnes usually has lunch at school
4. She likes physical education because it’s fun
5. Kim doesn’t go to school on Sundays
Ⅴ. 1-5 BCDFG
Ⅵ. 1-5 BACBC 6-10 CBDDA
Ⅶ. 1-5 BDCBC 6-10 BBCAD
Ⅷ. One possible version:
My Good Friend
七年级上学期寒假作业答案语数英 篇3
一、1. clever 2. easy 3. newspapers 4. windows 5. masters
6. glasses 7. newest 8. funny 9. wonderful 10. cameras
二、1–5 DDBCD 6–10 DBBCD
三、BDCEA
四、1. don’t do 2. Is there any 3. watches 4. Where does; live
5. When does;play 6. for Millie’s 7. good swimmer 8. was born
五、1. has 2. are 3. Does; take 4. to play 5. don’t watch
6. drawing 7. do; do 8. to keep 9. asking 10. visiting
六、1–5 ACBCA 6 – 10 DCCAC
七、1. My cousin also has a pair of football shoes.
2. This is a photo of my family.
3. Tom is the best at swimming in our class./ Tom is the best swimmer in our class.
4. The ticket for each adult is ten dollars.
5. Basketball players look tall and strong.
The 2nd Day
一、1 – 5 DGAJB 6 – 10 IEFCH
二、1 – 5 DDCBD 6 – 10 BDBBA
三、1. spends; writing 2. buy; for 3. is lying 4. I am; friend 5. Which man
6. Let’s go to school. 7. Don’t open the door, please
8. Are there any chairs; Yes, there are
四、1. A How 2. D Uncle John 3. D there is 4. C has 5. C be late
五、1. Are you; I’m 2. This is; twin brother 3. are nineteen students; a teacher
4. know this boy 5. best swimmer
六、1 – 5 BDCCB
The 3rd Day
一、DEABJFIGHC
二、1. grandparents’ 2. each 3. exercises 4. kind 5. email
6. both 7. price 8. information 9. together 10. except
三、1 – 5 BBDCA 6 – 10 CDBAC 11 – 15 DBACD
四、1. Both; and; are 2. Does; watch 3. What’s; price 4. goes to; by bus 5. like; best
五、1. All of the students in our class like this story very much.
2. We often have dinner at my grandparents’ home.
3. There are many kinds of flowers in the garden.
4. I don’t often make this kind of model plane.
5. I hope you can enjoy yourself at the party.
六、1. There are some walkmans in this shop.
2. I get happy when I dance.
3. Father goes to work without having breakfast.
4. Let him fly his kite in the park.
5. What is your hat made of?
七、1 – 5 ABBDC 6 – 10 CBCCD
The 4th Day
一、A) 1. teeth 2. candies 3. watches 4. brothers’ 5. activities
6. really 7. fishing 8. usually 9. holidays 10. closed
B) 1. on 2. for 3. in 4. at 5. on
6. of 7. with 8. by 9. as 10. at
C) 1. telling 2. to use 3. are listening 4. to have
5. Does; do 6. Is 7. turn 8. Are watching
二、1 – 5 CBCCD 6 – 10 BADBC
三、1. Children’s Day 2. Which umbrella; yours 3. Which festival do; like
4. my favourite sport 5. don’t think he is
四、1. calling — called 2. exciting — excited 3. have — having
4. to do — doing 5. for — as
五、1 – 5 DCBDA
六、1. same 2. Maths 3. student 4. only 5. with
6. hard 7. be 8. sport 9. Why 10. counts
The 5th Day
一、1 – 5 CBCBA 6 – 10 CBCCA
二、1. interesting 2. called 3. helpful 4. suitable 5. excited
6. first 7. swimmers 8. letting 9. having 10. Children’s
三、1 – 5 CBACC 6 – 10 BDACC
四、1. eating; with; in 2. make; out of 3. shines through
4. Which; sister’s favourite festival / Which festival does; like best 5. my first time
五、1. How long 2. Whose turn 3. Which woman
4. borrows; from 5. called 6. has
六、1 – 5 ABCAB 6 – 10 DCBDA
七、FFFFT
The 6th Day
一、DCCAB CBDAB
二、1. dress up as 2. people in the West 3. not…any more 4. play a trick on sb.
5. be on holiday 6. in many ways 7. my favourite festival 8. Happy Halloween
9. keep healthy 10. twice a week
三、1. drinks 2. September 3. shelves 4. Grey 5. posters
6. easy 7. lies 8. energy 9. Anyone 10. date
四、1 – 5 BDCBA 6 – 10 CDADB
五、1. Is there any fish on your shopping list?
2. It’s difficult for Americans to study Chinese.
3. Daniel wants to play basketball but he can’t run fast.
4. How long does your parter watch TV every week?
5. How often does Mrs White go swimming?
六、1. There is too much sugar in chocolate.
2. I like vegetables and fruit because they are good for me.
3. Is it time for babies to listen to music?
4. If you feel hungry and tired, have a cup of tea and have a rest.
5. Mr Li always reads newspapers before meals.
七、1 – 5 DCBCA 6 – 10 ACDCB
八、One possible version:
Tom usually has breakfast at home at 6:30.Before, he liked to have fast food. Now, he changed his diet. He often has some milk, bread and eggs for breakfast.At12:00, he has lunch at school. He often has some rice, meat and vegetables. Sometimes, he has fish. He often has supper with his family together. Now he is healthier than before.
The 7th Day
一、1. seldom 2. model 3. before 4. hungry 5. change
6. special 7. healthy 8. tired 9. twice 10. hamburgers
二、1 – 5 DDCAC 6 – 10 ADCAB
三、1. Why do; like 2. keep; fit/ healthy 3. Don’t; eat
4. What does; get 5. all the time
四、1. It’s very important to drink a lot of / a plenty of water every day.
2. How long do you sleep every day?
3. Good luck with your new diet and lifestyle.
4. Kitty plans to go swimming three times a week.
5. Students spend about seven hours a day studying at school.
五、1. This is not my mother’s sweater.
2. Does she want to dance?
3. I can learn a lot about Chinese History.
4. What is your favorite subject?
5. What time does she usually go to bed?
七年级上学期政治的寒假作业 篇4
1、随着欢快的步伐,我跨进了中学,面对新同学,新学校,我会:
①努力结交新朋友,创建新友谊。②在班级中快乐成长,与朋友结伴而行。③怀着美好的心情,尽量适应和体验全新的中学生活。④沉浸在小学的熟悉环境中,无比烦劳,难以自拔,难以适应。
A、①④B、②③④C、③④D、①②③
2、良好班风的情感基础是
A、爱心B、耐心C、细心D、互相帮助
3、要把我们的班集体建设成为一个良好的班集体,我们不应该
A、各自发挥自己的特长,为班级添砖加瓦。B、各自努力学习,不为班级事干扰。
C、自觉遵守班规班纪。D、团结协助,取长补短,共同提高。
4、下面最能体现班级上进心的是
A、只管自己成绩,其他与我无关。
B、只要把班集体搞好,学习好不好无所谓。
C、我的一言一行代表班级形象,我要做到“班级以我为荣’.
D、我一个人不会影响班级。
5、下列哪些行为是不合理的
A、班集体是班干部和老师的事,与我无关。
B、小张是个很热心的女孩,她推荐自己作为班级的劳动委员。
C、班长号召大家为集体团结协助。
七年级数学寒假作业答案 篇5
1、D;2、B;3、B,D;4、20;5、B;6、略
丰富的图形世界(二)解答:
1、D;2、A;3、D;4、D;5、C;6、B;7、最少9个,最多12个;
8、沿长绕一圈:36;沿宽绕一圈48;
《有理数及其运算》解答
1.C2.D3.B4.B.5.B.6.C7.D8.C9.D10.C11.B12.D
13.-314.15.-3.516.负数17.18.26,27.5,24.5;
19.(1)-8(2)(3)40(4)-3;20.略21.-2c;22.3;23.1
24.解:(1)设向上游走为正方向,
∵5+5-4-4.5=1+0.5=1.5,
∴这时勘察队在出发点上游1.5km,
(2)相距1.5千米,
(3)水利勘察队一共走了20km
25.(1)周五(2)35辆(3)-27,不足,少27辆
26.解:(1)∵不少于500元的,其中500元按9折优惠,
∴如果在该商场一次性购物500元实际付款是450元.
(2)设买a(a>500)元的物品.
根据题意得:实际付款=500×0.9+0.8(a-500)=(0.8a+50)元.
(3)购物用了138元时.∵138<200,∴138元没优惠.
购物用了482元时.∵0.8a+50=482,a=540;540-482=58
∴两次购物分别用了138元和482元,共节省了58元.
他还能再节省一点,方案是:可以合起来买,理由:合起来买时
∵138+540=678,而500×0.9+(678-500)×0.8=592.4,
∴678-592.4=85.6.故合起来买会更便宜,节约85.6元.
《整式的加减一》解答
一、1、A2、A3、D4、C5、B6、C
二、1、(1)a+b-c-d;(2)a-b-c+d;(3)_a+b+c-d;(4)-a+b-c.
2、a=__1__,b=_3_
3、(1)2n(2)700
4、n(n+2)=n2+2n
三、1、(1);(2)
(3).原式=2-9x-2x2,11
2、(1)S=32(2)S=3200;
3、4
4、(1)甲:(0.2x+500)元;乙:0.4x元;
(2)甲:980元;乙:960元;选择乙印刷厂比较合算;
(3)甲:7500份,乙:5000份;甲印刷厂印制的多,多2500份
《整式的加减二》解答
一、1A2B3C4C5D6D
二、1、-+
2、(1)n-1,n,n+1(2)2n-4,2n-2,2n
3、-2b4527689
三
1、(1)3(1-2ab2)-2(a2b-4ab2)
(2)x-(3x-2)+(2x-3);
解:原式=3-6ab2-2a2b+8ab2解:原式=x-3x+2+2x-3
=3-6ab2+8ab2-2a2b=x-3x+2x+2-3
=3+(-6ab2+8ab2)-2a2b=(x-3x+2x)+(2-3)
=3+2ab2-2a2b=-1
(3)3a2-2(2a2+a)+2(a2-3a),其中a=-2;
解:原式=3a2-4a2-2a+2a2-6a
=3a2-4a2+2a2-2a-6a
=(3a2-4a2+2a2)+(-2a-6a)
=a2-8a
将a=-2代入得,原式=(-2)2-8×(-2)
=4+16
=20
2、n2
3、10y+x10x+y
《基本平面图形》解答
基本平面图形(一):
1、B;2、D;3、C;4和5题略;6、60′,2520″,30°15′36〞;
7、5cm或15cm;8、15.5°;
9、(1)相等。
10、(1)∵∠AOC=130°且A,O,B在同一直线上
∴∠BOD=180°-130°=50°
∵OD是∠AOC的平分线
∴∠COD=∠AOC=×130°=65°
∵OE是∠BOC的平分线
∴∠COE=∠BOD=×50°=25°
∴∠DOE=∠COD+∠COE=65+25°=90°
(2)∠DOE的度数不变,仍为90°。理由如下:
由(1)知:∠COD=∠AOC,∠COE=∠AOC
∴∠DOE=∠COD+∠COE=∠AOC+∠BOD
=(∠AOC+∠BOD)
=×180°=90°
基本平面图形(二):
1、A;2、A;3、C;4、A;
5、(n-3)条,(n-2)个;6、15条;7、75度;8、2个;两点确定一条直线;9、1cm;
10、(1)∵∠AOE=100°,
又∵∠EOG由∠BOG折叠而来,
∴∠EOG=∠BOG
∴∠EOG+∠BOG+∠AOE=2∠EOG+∠AOE=180°
∴∠EOG=(180°-∠AOE)=×(180°-100°)=40°
(2)∵2∠EOG+∠AOE=180°
∴2y+x=180°
11、AC=AB+BC=6+4=10;AO=AB=×10=5;OB=AB-AO=6-5=1
《一元一次方程1》解答
一、选择题:CDAABD
二、7、n=1,m=1;8、40;9、24;10、a=7
三、解答题:
11、X=11;12、X=-3;
13、解:他开始存入x元,
(1+2.7%×6)x=5810
解得:x=5000
14、解:设原来男工X人,则女工(70-x)人
(1-10%)x=70-x+6
解得X=40
15、设上山速度为每小时xkm,那么下山速度为每小时1.5xkm,
依题意有:x+1=×1.5x,
解得:x=4
答:上山速度为每小时4km,下山速度为每小时6km,单程山路为5km.
《一元一次方程2》解答
一、选择题:DCCCBC
二、选择题:7、m=101;8、-13;9、1000元;10、2km/h
三、计算题:11、x=43;12、x=2;
13、设全校学生有x名
x-21x-41x-71x=3解得:x=28
14、设债券的年利率为X。
5000+5000×X×2(1-20%)=5400
X=5%
所以债券的年利率为5%
15、设哥哥追上弟弟和妈妈用时为X小时。
则方程为:6X=2+2X
解得:X=0.5小时。10x=10x0.5=5km
答:小花狗一共跑了5千米。
《数据的收集和处理》解答
1、(1)抽样调查(2)普查(3抽样调查)(4)抽样调查
(5)普查(6)抽样调查(7)普查
2、D
3、总体是某市今年9068名初中毕业生升学考试成绩的全体
个体是每个初中毕业生升学考试成绩;
样本是从中抽出300名考生的升学考试成绩;
样本容量是300.
4、折线统计图
5、能。能更直观看出各部分所占百分比
6、72度
7、C
8、D
9、(1)张老师抽取的样本容量=(人)
(2)图甲和图乙补充为:
(3)全年级填报就读职高的学生人数=225人
10、(1)x=12,y=1,m=0.24n=0.02
(2)等的扇形的圆心角度数=36度
(3)等人数=76人
数学高一上学期寒假作业参考答案 篇6
A.所有直角三角形
B.抛物线y=x2上的所有点
C.某中学高一年级开设的所有课程
D.充分接近3的所有实数
解析A、B、C中的对象具备“三性”,而D中的对象不具备确定性.
答案D
2.给出下列关系:
①12∈R;②2?R;③|-3|∈N;④|-3|∈Q.
其中正确的个数为()
A.1B.2
C.3D.4
解析①③正确.
答案B
3.已知集合A只含一个元素a,则下列各式正确的是()
A.0∈AB.a=A
C.a?AD.a∈A
答案D
4.已知集合A中只含1,a2两个元素,则实数a不能取()
A.1B.-1
C.-1和1D.1或-1
解析由集合元素的互异性知,a2≠1,即a≠±1.
答案C
5.设不等式3-2x<0的解集为M,下列正确的是()
A.0∈M,2∈MB.0?M,2∈M
C.0∈M,2?MD.0?M,2?M
解析从四个选项来看,本题是判断0和2与集合M间的关系,因此只需判断0和2是否是不等式3-2x<0的解即可.当x=0时,3-2x=3>0,所以0不属于M,即0?M;当x=2时,3-2x=-1<0,所以2属于M,即2∈M.
答案B
6.已知集合A中含1和a2+a+1两个元素,且3∈A,则a3的值为()
A.0B.1
C.-8D.1或-8
解析3∈A,∴a2+a+1=3,即a2+a-2=0,
即(a+2)(a-1)=0,
解得a=-2,或a=1.
当a=1时,a3=1.
当a=-2时,a3=-8.
∴a3=1,或a3=-8.
答案D
7.若a,b∈R,且a≠0,b≠0,则|a|a+|b|b的可能取值所组成的集合中元素的个数为________.
上学期二年级英语寒假作业答案 篇7
I 抄写字母,注意占格
II 1.k 2.j 3.l 4.f 5.d 6.b
III 电视―TV 中华人民共和国―PRC
中央电视台―CCTV 美利坚合众国―USA
3页 I 1―I like your kite. 2―Yes,I do. 3―Thank you!
II 1.一件黑色的衬衫 2.三件红色的T恤衫 3.6只黑色的鞋
5页 I 1.第2个句子√ 2.第1个句子√ 3. 第1个句子√ 4.第1个句子√
5.第2个句子√ 6.第1个句子√
II 1.D 2.C 3.A 4.B 5.B
III 1.dolls 2.cars 3.pandas 4.jigsaws
IV 1.B 2.C 3.C 4.A 5.B
9页 I H-h G-g B-b J-j L-l F-f
II +-*--Maths ABC―English 音乐符号―Music
III apple bag cow book chicken box
IV 1―B 2―A 3―D 4―E 5―C
11页 I A-a I-i M-m N-n E-e G-g F-f C-c
II 1.√ 2.× 3.× 4.√
12页 II mouth, nose, hand, finger
III Aa, Ee, Ii, Oo, Uu
13页 I 第一幅图T-shirt 第二幅图dad 第三幅图mum 第四幅图dress
II 1.A 2.B 3.C 4.A 5.A
III 1.Art 2.Science 3.Maths 4.English 5.Chinese 6.PE
IV 根据自己实际情况回答,注意单词拼写,句子开头首字母大写及标点
16页 I 1.have 2.play 3.frog 4.art 5.we 6.music 7.please 8.maths
II 1.4 o’clock 2.8 o’clock 3.11 o’clock 4.10 o’clock
5.1 o’clock 6.6 o’clock 7.2 o’clock 8.3 o’clock
III 1.6 o’clock 2.What’s the time? It’s 10 o’clock.
IV 1.Hello 2.are, fine 3.morning 4.name 5.and
V 1.What’s, It’s, It’s time 2.the time, It’s time
rn19页 I 1.a 2.d 3.e 4.f
II 1―B 2―A 3―D 4―E 5―C
III 1. A√ 2. B√ 3. A√
22页 I 1.g 2.h 3.g 4.i 5.h 6.h
IV 1.No,it isn’t. 2.Yes,it is. 3. No,it isn’t. 4. Yes,it is.
25页 I 1.起床 2.回家 3.上学 4.吃午饭 5.上床睡觉
6.7:30 7.9:00 8.3:00 9.6:30 10.5:00
四年级上学期英语寒假作业答案 篇8
二、boy desk fish、rice farmer school door father、doctor
三、CBABB BBCCB CAABB
四、1、mother、sister
2、beef、fish、bread、rice
3、book、bag、pencil
4、kitchen、bathroom、living-room、study
五、ABCBACC
六、略
七、are Is are is are
八、1、去上学 2、上音乐课 3、吃早餐 4、粉色短裤 5、穿上你的毛衣
6、在二楼 7、在墙上 8、回家 9、去看看 10、十台新电脑
九、ABABA
十、BAAAB
十一、
1、EACBD GHIKF JML
2、CBDAE
3、CEBAD
十二、1、There are five birthdays in July.
2、Can I have some sweets?
3、I am going to run every day.
4、Can he jump far?
5、Can you play the flute?
6、They are going to go to the zoo.
7、Do you have a library?
8、What colour is your shirt.
9、I like the yellow shirt.
10、Is that my pencil?
十三、A:3、1、4、2、5 B: 7、2、5、3、1、4、6
十四、CEADB
十五、F,E/C,A,B,D,E/C E/A,B,C,E/A,F,D E,C,D,A,B
十六、开灯,扫地,擦窗户,贴图片,擦黑板
十七、has does on learned walk
十八、Chinese inverted walked ate come bought helped cup ride trouble
十九、1、What would you like? 2、where is she?
3、what is his name? 4、what is in your bookshelf?
5、what is his job? / what does he do?
二十、TFTFF
七年级数学上学期寒假作业答案 篇9
三、have are are has is
四、a b b c c a
p22
there is a bed ,a clock, a tv.
一、
1=1 2=4 3=2 4=3 5=5
p23
二、
ee画树 i e 河 ou 房子 a e 湖 i 高山 e t 森林
三、cabbcb
四、画图略
p24
五、bike photos bottles beside behind
六、ftttf
p26
2=4 2=5 3=1 4=3 5=2
二、mouse house sound count about
cow down wow flower
三、cedabf
p27
四、lake tree bridge house mountain flower
五、314256
六、bbbab
p28
七、are there any animals?
let us go boating.
there is a like neae the villag.
人教版七年级寒假数学作业答案 篇10
∵ ac=bd
∴ ab+bc= bc+cd
∴ ab=cd
又 ∵ 点e是bc的中点
be = ce
∴ab+be = cd+ce
∴ ae=de
∴点e是线段ad的中点
(2)、be=2;
(4)、
[七年级数学寒假作业]系列8一――《相交线与平行线》(一)解答
一、1、d 2、d 3、a 4、c 5、b 6、b 7、140°8、120°
9、80° 10、20 11、45°
12、∠bad=150°,∠eac=60°,∠c=30°
13、∠a=44°,∠b=34°,∠c=102°
14、结论是:∠bed=∠b+∠d ;理由略
15、结论是: de∥cf ;理由略
[七年级数学寒假作业]系列8一――《相交线与平行线》(二)解答
一、1、c 2、30° 3、ab //cd 4、b 5、360°6、b 7、80°
8、da //cb 9、略 11、∠aoc= 45,∠boc=135° 12、略
13、略 14、∠a=60° 15、略
寒假作业答案:
[七年级数学寒假作业]系列1一――《丰富的图形世界》解答
丰富的图形世界(一)解答:
1、d; 2、b; 3、b,d; 4、20; 5、b; 6、略
丰富的图形世界(二)解答:
1、d; 2、a; 3、d; 4、d; 5、c; 6、b; 7、最少9个,最多12个;
8、沿长绕一圈:36;沿宽绕一圈48;
[七年级数学寒假作业]系列2――《有理数及其运算》解答
1.c 2.d 3.b 4.b. 5.b. 6.c 7.d 8.c 9.d 1 0.c 11.b 12.d
13. -3 14. 15.-3.5 16. 负数 17. 18. 26,27.5,24.5;
19.(1)-8 (2) (3)40 (4)-3 ; 20.略 21. -2c; 22. 3; 23. 1
24. 解:(1)设向上游走为正方向,
∵5+5-4-4.5 = 1 +0.5 = 1.5,
∴这时勘察队在出发点 上游 1.5 km ,
(2)相距1.5千米,
(3)水利勘察队一共走了20 km
25.(1)周五(2)35辆 (3)-27,不足,少27辆
26. 解:(1)∵不少于500元的,其中500元按9折优惠,
∴如果在该商场一次性购物500元实际付款是450元.
(2)设买a(a>500)元的物品.
根据题意得:实际付款=500×0.9+0.8(a-500)=(0.8a+50)元.
(3)购物用了138元时. ∵138<200,∴138元没优惠.
购物用了482元时.∵0.8a+50=482,a=540;540-482=58
∴两次购物分别用了138元和482元,共节省了58元.
他还能再节省一点,方案是:可以合起来买,理由:合起来买时
∵138+540=678,而500×0.9+(678-500)×0.8=592.4,
∴678-592.4=85.6.故合起来买会更便宜,节约85.6元.
[七年级数学寒假作业]系列3――《整式的加减一》解答
一、1、 a 2、a 3、d 4、c 5、b 6、c
二1、(1)a+b-c-d ;(2)a-b-c+d;(3)_a+b+c-d;(4)-a+b-c. 2、
3、a=__1__,b=_3_ 4、 5、(1)2n (2) 700
6、n(n+2)=n2 +2n
三、1、(1);(2)
(3). 原式=2-9x-2 x 2,11
2 (1)s=32 (2) s=3200 ; 3、4
4(1)甲:(0.2 x+500)元;乙:0.4 x元;
(2)甲:980 元;乙:960元;选择乙印刷厂比较合算;
(3)甲:7500份,乙:5000份;甲印刷厂印制的多,多2500份
[七年级数学寒假作业]系列3――《整式的加减二》解答
一 1 a 2 b 3 c 4 c 5 d 6 d
二 1 - +
2 (1) n-1,n,n+1 (2) 2n-4,2n-2,2n
3 -2b 4 5 27 6 89
三
1、(1) 3(1-2ab2)-2(a2b-4ab2) (2) x-(3x-2)+(2x-3);
解:原式=3-6ab2-2a2b+8ab2 解:原式= x-3x+2+2x-3
=3-6ab2+8ab2-2a2b = x-3x+2x+2-3
=3+(-6ab2+8ab2)-2a2b = (x-3x+2x)+(2-3)
=3+2ab2-2a2b = -1
(3) 3a2-2(2a2+a)+2(a2-3a),其中a=-2;
解:原式=3a2-4a2-2a+2a2-6a
=3a2-4a2+2a2-2a-6a
=(3a2-4a2+2a2)+(-2a-6a)
= a2-8a
将a=-2代入得,原式=(-2)2-8×(-2)
= 4+16
= 20
2、n2
3、10y+x 10x+y 4、 .5、。6、5
[七年级数学寒假作业]系列4――《基本平面图形》解答
基本平面图形(一):
1、b; 2、d; 3、c; 4和5题略;6、60′,2520′,30°1536; 7、5cm或15cm; 8、15.5°;
9、
10、(1)相等。理由如下:
(2)
11、(1)∵∠aoc=130°且a,o,b在同一直线上
∴∠bod=180°-130°=50°
∵od是∠aoc的平分线
∴∠cod=∠aoc=×130°=65°
∵oe是∠boc的平分线
∴∠coe=∠bod=×50°=25°
∴∠doe=∠cod + ∠coe=65+25°=90°
(2) ∠doe的度数不变,仍为90°。理由如下:
由(1)知:∠cod=∠aoc,∠coe=∠aoc
∴∠doe=∠cod + ∠coe =∠aoc +∠bod
=(∠aoc +∠bod)
= ×180°=90°
基本平面图形(二):
1、a; 2、a; 3、c; 4、a;
5、(n-3)条,(n-2)个; 6、15条; 7、75度; 8、2个;两点确定一条直线; 9、1cm;
10、(1)∵∠aoe=100°,
又∵∠eog由∠bog折叠而来,
∴∠eog=∠bog
∴∠eog+∠bog+∠aoe=2∠eog+∠aoe=180°
∴∠eog=(180°-∠aoe)= ×(180°-100°)=40°
(2) ∵2∠eog+∠aoe=180°
∴2y+x=180°
11、ac=ab+bc=6+4=10;ao=ab=×10=5;ob=ab-ao=6-5=1
12、
[七年级数学寒假作业]系列5――《一元一次方程1》解答
一、选择题:cdaabd
二、7、n=1,m=1;8、40;9、24;10、a=7
三、解答题:
11、x=11 ;12、x= -3;
13、解:他开始存入x元,
(1+2.7%×6)x=5810
解得:x=5000
14、解:设原来男工x人,则女工(70-x)人
(1-10%)x=70-x+6
解得x=40
15、设上山速度为每小时xkm,那么下山速度为每小时1.5xkm,
依题意有:x+1=×1.5x,
解得:x=4
答:上山速度为每小时4km,下山速度为每小时6km,单程山路为5km.
[七年级数学寒假作业]系列5――《一元一次方程2》解答
一、选择题:dcccbc
二、选择题:7、m=101;8、-13;9、1000元;10、2km/h
三、计算题:11、x=43;12、x=2;
13、设全校学生有x名
x- 21x-41x- 71x=3 解得:x=28
14、设债券的年利率为x。
5000+5000×x×2(1-20%)=5400
x=5%
所以债券的年利率为5%
15、设哥哥追上弟弟和妈妈用时为x小时。
则方程为:6x=2+2x
解得:x=0.5小时。10x=10 x0.5=5km
答:小花狗一共跑了5千米。
[七年级数学寒假作业]系列6――《数据的收集和处理》解答
1、(1)抽样调查(2)普查(3抽样调查)(4)抽样调查
(5)普查(6)抽样调查(7)普查
2、d
3、总体是某市今年9068名初中毕业生升学考试成绩的全体
个体是每个初中毕业生升学考试成绩;
样本是从中抽出300名考生的升学考试成绩;
样本容量是300.
4、折线统计图
5、能。能更直观看出各部分所占百分比
6、72度
7、c
8、d
9、(1) 张老师抽取的样本容量=(人)
(2)图甲和图乙补充为:
(3)全年级填报就读职高的学生人数=225人
10、(1)x=12, y=1, m=0.24 n=0.02
(2) 等的扇形的圆心角度数=36度
(3)等人数=76人
等人数=92人
[七年级数学寒假作业]系列7――《综合训练一》答案:
一、 选择题:ccbcd, abaac,
二、 填空题:11、4,1;12、23.16度;13、7;14、36度;15、3.5mn;
三、 解答题:
16、(1) -20; (2)、25; (3); (4)
(5)、x=9; (6)、 x=5/8;
17、∠eof=62b;
18、解:a品牌利润:100w120=1XX元;b品牌利润:48000w30%=14400元;
c品牌利润:48000-1XX-14400=21600元;
∴a品牌所占百分比: a品牌圆心角度数:25%w360b=90b;
c品牌所占百分比: c品牌圆心角度数: 45%w360b=162b;
b品牌销售台数:(台)
c品牌销售台数:(台)
19、小张到火车站30米远;具体解答如下:
解:设小张家到火车站有x千米,可得: 15分=1/4小时
x/60+x/120+1/4=x/30
2x+x+30=4x
x=30
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