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初二寒假作业

来源:免费论文网 | 时间:2016-09-28 14:10:54 | 移动端:初二寒假作业

篇一:初二数学寒假作业

初二数学寒假作业(1)

一、精心选一选

⒈下列各组条件中,不能判定△ABC与△DEF全等的是 ( ) A. AB=DE,∠B=∠E,∠C=∠F B. AC=DF,BC=DE,BA=EF C. AB=EF,∠A=∠E,∠B=∠F D. ∠A=∠F,∠B=∠E,AC=EF

⒉判定两个三角形全等必不可少的条件是 ( ) A.至少有一边对应相等 B.至少有一角对应相等 C.至少有两边对应相等 D.至少有两角对应相等

⒊在△ABC和△DEF中,已知AB=DE,∠A=∠D,还需具备什么条件①AC=DF;②BC=EF;③∠B=∠E;④∠C=∠F,才能推出△ABC≌△DEF,其中符合条件有( ) A、1个B、2个 C、3个 D、4个 二、细心填一填

⒋ 如图1,AO平分∠BAC,AB=AC,图中有__________________对三角形全等.

B

图1 C D 图2

A

⒌ 举例说明三角形稳定性在生活中的应用:_______________________________.

⒍ 如图2,在△ABC中,∠C=90,AD是∠BAC的平分线,交BC于D,BC=16,DC:DB=3:5,则点D到AB的距离是___________. 三、用心做一做

⒎如图,已知AD=AE,AC=AB,∠A=40, ∠B=35,求∠EOC的度数

⒏.如图,已知∠1=∠2,∠3=∠4,AB与CD相等吗?请你说明理由.

B

C

初二数学寒假作业(2)

一、精心选一选

⒈下列说法中正确的是( ) A.三个角对应相等的两个三角形全等. B.面积相等的两个三角形全等.

C.全等三角形的面积相等.D.两边和一角对应相等的两个三角形全等. ⒉在ΔABC和ΔA′B′C′中,AB=A′B′,∠B=∠B′,补充一个条件后仍不一定能保证ΔABC与ΔA′B′C′全等,则补充的这个条件是( ) A.BC=B′C′B.∠A=∠A′ C.AC=A′C′ D.∠C=∠C′

⒊在△ABC和ΔA′B′C′中,AB= A′B′ ,∠A=∠A′,∠C=∠C ′ ,可推出(1)∠B=∠B′;(2)∠B的平分线与∠B′的平分线相等;(3)BC边上的高与B′C′边上的高相等;(4) BC边上的中线与BC边上的中线相等.其中正确的结论有 ( ) A. 1个 B. 2个 C. 3个 D. 4个 二、细心填一填

⒋如图1: 在ΔABC和ΔADC中,下列三个论断:⑴AB=AD,⑵∠BAC=∠DAC,⑶BC=DC,将其中两个论断作为条件,另一个论断作为结论,请你写出一个正确的推断:

//

⒌如图2,在ΔABC与ΔAED中,AB=AE,AC=AD,请补充一个条件条件:____________(写一个即可)

,使ΔABC≌ΔAED.

⒍如图3,在ΔABC中,∠C=90,AC=BC,AD平分∠CAB, 交BC于D,DE⊥AB于E,且AB=6cm,则ΔDEB的周长为________. 三、用心做一做

⒎如图,AC=BD,AC⊥AB,DB⊥CD,则AB与DC相等吗?为什么?

B

C

A

图3

⒏如图,ΔABC中,BE、CD分别是AC、AB边上的高,BE、CD相交于点O,若AO平分∠BAC,那么OB=OC吗?为什么?

C

初二数学寒假作业(3)

一、精心选一选

⒈满足下列条件的两个等腰三角形,不能判定它们全等的是( ) A.两腰对应相等B.一腰和顶角对应相等 C.一腰和底边对应相等D.一腰与该腰上的中线对应相等

⒉根据下列条件,能画出唯一的△ABC的是( ) A.AB=3,BC=4,AC=8 B.AB=4,BC=3,∠A=300 C.∠A=600,∠B=450,AB=4D.∠C=900,AB=6

⒊三角形的两条边的长分别为5和7,则第三边上中线的取值范围是 ( )A.a<6 二、细心填一填

⒋如图1,已知AB⊥BD于B,ED⊥BD于D,AB=CD,BC=DE,则∠ACE=___________°.

A

B.a>1 C.1<a<6

D.1≤a≤6

D

1

⒌如图2,已知AB∥CF,E为DF的中点,若AB=9cm,CF=5cm,⒍如图3,在等腰△AOB的腰OA、OB上截取OC=OD,连结AD、BC交于点P,下列结论:①△AOD≌△BOC;②△APC≌△BPD;③点P在∠AOB的平分线上;④AP=DP.其中正 确的有__________.(填序号) 三、用心做一做

图3

⒎如图,如果∠1=∠2,∠3=∠4,AC、BD相交于点O,那么线段BD与AC有什么关系?为什么?

B

C

⒏如图,已知△ABC,BE、CF为高,CP=AB,BD=AC,试判断AP与AD有什么关系?并说明你的理由.

C

初二数学寒假作业(4)

一、精心选一选

⒈在△ABC与△A′B′C′中,∠A+∠B=∠C,∠B′+∠C′=∠A′,且b-a=b′- c′,b+a=b′+c′,则这两个三角形 ( ) A.不一定全等B.不全等 C.根据“SAS”全等 D.根据“ASA”全等 ⒉下列图形中,一定全等的是 ( ) A. 有一边相等的两个等腰三角形 B.两个等边三角形 C.有一个角是45,腰长都是3cm的两个等腰三角形 D.一个锐角和一条直角边对应相等的两个直角三角形

⒊如图1,A、B、C、D在同一条直线上,AB=DC,AE∥DF,在下列条件中,不能使 △AEC与△DFB全等的是A.AE=DFC.EC∥BF 二、细心填一填

B.EC=FBD.∠E=∠F

⒋ 如图2,已知△ABC中,∠C=900,点D在AC上,DE⊥AB,垂足为E,且DC=DE,∠CBD:∠A=2:1,则∠A=______.

B

3

C

D图2

C

⒌如图3,在不等边三角形△ABC中,AQ=PQ,PM⊥AB,PN⊥AC,PM=PN.①AN=AM;②QP∥AM;③△BMP≌△PNC.其中正确的是______________(填序号).

⒍如果两个等腰三角形_______________时,那么这两个等腰三角形全等.(只填一种能使结论成立的条件即可). 三、用心做一做

7.如图,点D、E分别是等边△ABC的两边AB、AC上的点,且AD=CE,BE与CD交于F,求∠

BFC的度数.

8.如图,在△ABC、△AED中,AB=AC,AD=AE,且∠CAB=∠DAE. ⑴问CE与BD有什么关系?为什么?

⑵若将△AED绕着点A沿逆时针方向旋转,使D、E、B在一条直线上,⑴的结论还成立吗?若成立,请说明理由.

初二数学寒假作业一、精心选一选

1.(2011·泰安)下列等式不成立的是( )

A.m2-16=(m-4)(m+4) B.m2+4m=m(m+4) C.m2-8m+16=(m-4)2D.m2+3m+9=(m+3)2 2.(2011·无锡)分解因式2x2-4x+2的最终结果是( )

A.2x(x-2) B.2(x2-2x+1) C.2(x-1)2 D.(2x-2)2 3.(2011·济宁)把代数式 3x3-6x2y+3xy2分解因式,结果正确的是( )

A.x(3x+y)(x-3y)B.3x(x2-2xy+y2) C.x(3x-y)2D.3x(x-y)2

4.已知x、y满足等式2x+x2+x2y2+2=-2xy,那么x+y的值为( )

A.-1 B.0 C.2D.1 5.(2011·台湾)下列四个多项式,哪一个是2x2+5x-3的因式?( )

A.2x-1B.2x-3C.x-1 D.x-3

二、细心填一填

6.(2011·绍兴)分解因式:x2+x=______________.

7.(2011·枣庄)若m2-n2=6,且m-n=2,则m+n=________. 8.(2011·威海)分解因式:16-8(x-y)+(x-y)2=______________. 9.(2011·潍坊)分解因式:a3+a2-a-1=______________. 三、用心做一做

10.(2011·湖州)因式分解:a3-9a.

C

篇二:运河中学2014年初二数学寒假作业

运河中学

初二年级数学

班级___________姓名____________

练习一 日期 ______月________日 共用_______分钟 家长签字 一、计算 1、(?144)?(?169)2、

2333

4

?(?945)

二、化简

3、2m2n5p2q5mnp3pq2?4mn2

?3q

4、(

x?2x?2x2x?2?x?2)??4

x2

三、化简求值 5、

4x2

?16?2x?4?x

x?4

,其中x?3

四、解方程 6、

x?1x?1?1

x

?1

五、列方程解应用题 7、一个工厂接了一个订单,加工生产720 t

产品,预计每天生产48 t,就能按期交货,

后来,由于市场行情变化,订货方要求提前5天完成,问:工厂应每天生产多少吨?

1

六、几何题

8、如图,已知AC平分∠BAD,∠1=∠2,求证:AB=AD

10、△ABC中,∠BAC=60°,∠C=40°AP平分∠BAC交BC于P,BQ平分∠ABC交AC于Q,AP、BQ交于点O。 求证:AB+BP=BQ+AQ.

9、在△ABC中,∠C=90°,∠B=15°,D是 AB中点,DE⊥AB于D,交BC于E,若BE=4, 求AC的长

2

练习二 日期 ______月________日 共用_______分钟 家长签字 一、计算 1、??1???7???28??

???1?3??

2

二、化简

3、a2

?4a?4a2?2a?1?a?1

a2?4

4、(x?1?3x?1)?x?22x?2

三、化简求值

x?35

、x2?1?x2?2x?31

x2?2x?1?x?1,

其中x??1

四、解方程 6、

1?3x31?3x?x?13x?1?12

1?9x

2

五、列方程解应用题 7、甲队单独做一项工程刚好如期完成,乙队单独完成这项工程要比预期多用3天.若甲、乙两队合作2天,余下的工程由乙队单独做

也正好如期完成,则规定的工期是多少天?

3

六、几何题

8、如图,已知点E、C在线段BF上,BE=CF,AB∥DE,∠ACB=∠F.

求证:△ABC≌△DEF.

10、如图,△ABC中,AD平分∠BAC,

DG⊥BC且平分BC,DE⊥AB于E, DF⊥AC于F.

(1)说明BE=CF的理由;

(2)如果AB= a,AC= b,求AE、BE的长

B E C F

9、如图,在四边形ABCD中,AD∥B C,点E 是AB上一个动点,∠B=60°,AB=BC

,∠ DEC=60°

证明:AD+AE=BC

4

ABG

CFD

篇三:初二英语寒假作业答案

初二英语寒假作业答案

寒假作业一 unit1

一,unhappy problem bad square test advice famous real joy diving

二,climbing speaking camping laugh thought solve smiling not to be to give,

to become,

三,healthy healthily, bored, more, singer, more dangerous, pleasant, the most nervous, interesting, the

worst, slimmer,

四,BCDDA DCBDB CBADB

五,BDCBD ACBDA

寒假作业二 unit2

一 heroes, tasty, subject, seniors, admired, article, geography science unimportant, practicing, languages, history,

二 visitors, useless, fewer less, twice, mixed, myself, driving, unpopular, pleasant, boring,

三DCAAB ACDAD BBAAD BACDB BBCAA

四 help, doesn’t rain, asking, chatting, is going to be doing, opening, put ran, to be, washing, will arrive, arrives will have talking

寒假作业三 unit3

一 to meet, themselves, to close clean, inviting, buildings, beginning, more, interest, amazing, visiting 二to go on a trip to places of, to visit, whole front of, took by, to join in to,

三invitation, interesting, quickly, yourself, beauty,

四,ADBAC CDBAA

五 had fun, at the beginning, feel sick, felt exited, places of interest, in front of

六 called, keeping, to have, climbers, winner, snows, less doing, players, walking, alike

七 1 it is big and white. 2 we should protect them

3 they kill them for their beautiful white coat.

4they live in the snow and ice. 5 A

寒假作业四 unit4

一, leaves, encourages, elephants’ hunting, least, badly, to protect, characters, smells, sharp well 二, BAACB BACBB DCDCB BDCBD ACB

三, To live, is playing, buys, stops, don’t study, won’t, pass, playing, will be, waiting, to have, to

continue,

四, Keeping passing and 2if we don’t protect wild animals any more, there will be no wild animals in the world.

3we must take the following actions to prevent them hunting animals. 4 her coat is made pf animal fur.. 5trying to 6 couldn’t believe. 7the baby didn’t stop crying until his mother came back. 8 the meeting doesn’t start until everyone comes. 9 if I can find the wolf hill, I will be very happy. 10 can he live alone, I am afraid he can’t. 11 if I go to nature reserve, I will watch the lions carefully.

Unit5

一、单项选择

BCDAA DDDAC BCDDC DDACB

二、1. longer interesting 2. less 3. hottest coldest 4. laugh 5. hiking 6. closed 7. to help 8. watching 9. better 10. the prettiest

三、1. to protect. 2. carefully 3. hearing 4. action 5. northern 6. continue 7. preparing 8. science

四、1. noisily 2. unhappy 3. disappear 4. peaceful 5. living 6. wetter

五、1. feel 2. shining 3. is sleeping 4. reading 5. dropping 6. comes 7. to see 8. be 9. will arrive 10. have told

Uni6

一、BCDCA CCACD CABDC ABCC

二、1. brightly sunny 2. snowy 3. foggy 4. windy strongly 5. worse 6. easily

三、1. to lock 2. not to talk 3. look 4. doing 5. not to get 6. playing playing 7. to learn speaking 8. to be

9. happen 10. working

四、BCDAB CDABB

五、DBDAD

吴中区

选择题 DACDB CADCB BDBCA

完型填空CBAAB DCCDA

阅读理解A)ADB B)DBC C)ABAC

四.56.comfortably 57.worst 58.information 59.yourselves 60.accidents 61.frightening 62.training

63.dropped 64.luckier 65.providing

五.句子翻译

1.This means more and more birds will disappear.

2.The English teacher always encourages us to speak a little English every day.

3.If you want to get rich,you must build roads first.

4.No one knows how that house caught fire last night.

5.Because of clean air.more and more people like to live in the country.

6.When people found Timmy still alive,they couldn’t wait to move away bricks and stones.

苏州市

二、单选 CBCAD BBCDD AA

完型 BADDB ACDCB

三、阅读理解:ADB BAD ACBC

四、1. hobbies 2. encourages 3. easily 4. heroes 5. fewer 6. protecting 7. natural 8. outside

五、1. My teacher has a good sense of humour.

2. Your school uniform is the same as theirs.

3. This song makes her really happy.

4. My mother bought me a mobile phone.

5. What were you doing when the bell rang?

六、1. Where do you plan to go for a trip?

2. There are a lot of places of interest in Suzhou.

3. Thank you for keeping the secret for me .

4. We will go to the park if it is fine tomorrow.

5. It’s impolite to ask a lady’s age in western countries.

七、略

2010-2011学年第一学期期末模拟测试卷八年级英语

单词拼写:

1.kilometres2. birth 3. firemen4. accident 5. peaceful

6. angrily 7. forest(s) 8. airport 9. foreign 10.directions

词形变化

1.incorrect 2. foggier3. Mice 4.hunters 5.winners

6. northern 7.dishonest 8.babies 9.loss10. wolves’

句型转换:

1.wasn’t able to by herself 2.didn’t think were 3.how many fish did catch

4.How nicely 5. a ,member of 6.drives carefully

单项选择:

1.C2.A3.A4.C5.D6.B7.B8.A9.D10.C11.B12.C13.B14.A15.D16.D17.B18.B19.D20.A

动词填空:

1.continued 2.was sewing 3.smells 4.was sleeping 5.to shout 6.is playing 7.will miss

8.dropping 9.weighed 10.will solve

完形填空:

1.A2.B3.A4.D5.B6.C7.A8.D9.B10.C

阅读理解:

1. D2.B3.A4.D5.A6.B7.C8.C9.C10.A11.C12.B13.D14.C15.A

句子翻译:

1. My parents are busy all year roundD.

2. They looked each other in fear at that moment.

3. You need to exercise more to keep healthy.

4. The teacher often encourages us to speak English after class.

5. We must prevent people from cutting down trees.

6. There will be a heavy snow in northeast China tonight.

书面表达略

附加题 单词拼写:

1.bamboo2.nowhere 3.wild 4.information 5.outside

6.Thick 7.delicious 8.following 9.train 10.loss

11.incorrect 12.quietly/softly 13.warning 14.thunder 15.Lightning

16.terrible 17.bricks 18.sandstorm 19.selling 20.arrival

词形变化:

1.hearing 2.suitable 3.wolves 4.hobbies 5.wetter 6.excitedly 7.nicely 8.myself 9.foggy 10.caller’s

动词填空:

1. will win 2.hunted 3.playing 4.sing5.isn’t6.was shining7.finishes8.to talk9.was mopping 10.broke

选择题:

16.D17.B18.B19.D20.D21.D22.C23.D24.A25.B26.A27.C28.C29.A30.C

完形填空:

31.D32.B33.B34.C35.A36.A37.C38.D39.D40.A

阅读理解:

41.B42.C43.A44.B45.C46.B47.C48.C49.B50.C51.B52.C53.A54.D

56 fear 57 medicine 58 twice 59 encourages 60 accident 61healthy 62 unusual 63 foggy 64 trapped 65 endangered 66 Don’t play 67 If will 68 How often 69 How does 70 were playing

71 In the future ,people will make good friends with animal.

72 Last year, the flood washed all things of the village.

73 Thousands of people are trying to save the people trapped in the fire.

74 My brother is interested in football.

75 A moment of fear went through my mind.

76 poor 77 because 78 took 79 also 80 bird

81 use 82 same 83 mind 84 enough 85 parents 86 few 87 or 88 good 89 remember 90 so

一 单项填空

1-5 DCBBB 6-10 BDDCD 11-15 DDDAA

二 完型填空

1-5 BDCBC 6-10 BDABA

三 阅读理解

DDDC

四 单词拼写

1 sadly 2 shaking 3 hotter 4 February 5Leaves 6 importance 7 Almost 8 heroes 9 traffic

10 encouraged

五 动词填空

1 useless 2 skiing 3 moves 4 Wolves 5 Luckily 6 worse


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