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2017重庆出版社八年级寒假作业答案

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2017重庆出版社八年级寒假作业答案篇一

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.某广告公司欲招聘广告策划人员一名,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.{2017重庆出版社八年级寒假作业答案}.

+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重庆出版社八年级寒假作业答案篇二

2016八年级寒假作业上

初二数学寒假作业1(全等三角形)

一、填空与选择

1.已知△ABC≌△DEF,∠A=80°,∠E=50°,则∠F的度数为( )

A、 30° B、 50° C、 80° D、 100°

2.已知图中的两个三角形全等,则的度数是( )

A.72° B.60° C.58° D.50°

3.如图,∠E=∠F=90°,∠B=∠C,AE=AF,给出下列结论:①∠1=∠2;②BE=CF;③△ACN≌△ABM;④CD=DN,其中正确的结论有( )

A、1个 B、2个 C、3个 D、4个

c B 58°

c b 第3题图 第2题图

4

.△ABC是格点三角形(顶点在网格线的交点),则在图中能够作出△ABC全等且有一条公共边的格点三角形(不含△ABC)的个数是( )

A、1个 B、2个 C、3个 D、4个

5.如图,AC、BD相交于点0,∠A=∠D,请补充一个条件,使△AOB≌△DOC,你补充的条件是 (填出一个即可).

BECF 第8题图 第9题图 第7题图 第6题图

图26.已知,如图:∠ABC =∠DEF,AB =DE,要说明△ABC ≌△DEF:

1)若以“SAS”为依据,还要添加的条件为______________;

2)若以“ASA”为依据,还要添加的条件为______________;

3)若以“AAS”为依据,还要添加的条件为______________.

7.如图∠ACB=∠DFE,BC=EF,根据“ASA”,应补充一个直接条件___________,根据“AAS”,那么补充的条件为____________,才能使△ABC≌△DEF.

8.如图,在Rt△ABC中,∠C=90°,AC=10,BC=5,线段PQ=AB,P、Q两点分别在AC和过点A且垂直于AC的射线AO上运动,当AP= 时,△ABC和△PQA全等.

9.如右图示,△ABE和△ADC是△ABC分别沿着AB,AC边翻折180°形成的,若∠1∶∠2∶∠3=28∶5∶3,则∠α的度数为 。

10.AD是△ABC的边BC上的中线,AB=12,AC=8,则中线AD的取值范围是

二、简答题

11.如图,在△ABC和△ABD中,AC与BD相交于点E,AD=BC,∠DAB=∠CBA,

求证:AC=BD.

12.如图,AC和BD相交于点O,OA=OC,OB=OD.求证:DC∥AB.

13.如图,已知点A、F、E、C在同一直线上,AB∥CD,∠ABE=∠CDF,AF=CE.

(1)从图中任找两组全等三角形;(2)从(1)中任选一组进行证明.

14.在△ABC中,AB=AC,点E,F分别在AB,AC上,AE=AF,BF与CE相交于点P.求证:PB=PC,并直接写出图中其他相等的线段.

15.如图,已知:在△AFD和△CEB中,点A、E、F、C在同一直线上,AE=CF,∠B=∠D,AD∥BC.求证:AD=BC.

16.如图,C为BE上一点,点A,D分别在BE两侧.AB∥ED,ABCE,BCED.那么AC与CD相等吗?并说明理由.

E B

D

17.如图,∠DCE=90°,CD=CE,AD⊥AC,BE⊥AC,垂足分别为A、B.求证:AD+AB=BE.

18.如图①A、E、F、C在一条直线上,AE=CF,过E、F分别作DE⊥AC,BF⊥AC,若AB=CD.

(1)图①中有 对全等三角形,并把它们写出来

(2)求证:BD与EF互相平分于G;

(3)若将△ABF的边AF沿GA方向移动变为图②时,其余条件不变,第(2)题中的结论是否成立,如果成立,请予证明.

19.CD经过BCA顶点C的一条直线,CACB.E,F分别是直线CD上两点,且BECCFA.

(1)若直线CD经过BCA的内部,且E,F在射线CD上,

①如图1,若BCA90,90,则BE CF;

②如图2,若0BCA180,请添加一个关于与BCA关系的条件 ,使①中的结论仍然成立,并说明理由.

(2)如图3,若直线CD经过BCA的外部,BCA,请提出EF,BE,AF三条线段数量关系的合理猜想: .

A D D

A A (图1) (图2) (图3)

20.如图,已知△ABC中,AB=AC=5厘米,BC=4厘米,点D为AB的中点.如果点P在线段BC上以1.5厘米/秒的速度由B点向C点运动,同时,点Q在线段CA上由C点向A点运动.

(1)若点Q的运动速度与点P的运动速度相等,经过1秒后,△BPD与△CQP是否全等,

请说明理由;

(2)若点Q的运动速度与点P的运动速度不相等,当点Q的运动速度为多少时,能够使

△BPD与△CQP全等?

初二数学寒假作业2(轴对称图形)

一、精心选一选

1.如图,下列图案是我国几家银行的标志,其中是轴对称图形的有( )

A .1个 B. 2个 C. 3个 D. 4个

2.在△ABC内一点P满足PA=PB=PC,则点P一定是△ABC( )

A.三条角平分线的交点 B.三边垂直平分线的交点

C.三条高的交点 D.三条中线的交点

3.下列语句:①全等三角形的周长相等②面积相等的三角形是全等三角形③若成轴对称的两个图形中的对称线段所在直线相交,则这个交点一定在对称轴上.其中正确的有( )

A.0个 B.1个 C.2个 D.3个

4.用直尺和圆规作一个角的平分线的示意图如图所示,则能说明∠AOC=∠BOC的依据是( )

A.SSS B.ASA C.AAS D.角平分线上的点到角两边距离相等

第4题图

5.如图是一个经过改造的台球桌面示意图,图中四个角上的阴影部分分别表示四个入球孔。如果一个球按图中所示的方向被击出(球可以经过多次反射),那么该球最后将落入的球袋是( )A、一号袋 B、二号袋 C、三号袋 D、四号袋

6.如图,∠MON内有一点P,P点关于OM的轴对称点是G,P点关于ON的轴对称点是H,GH分别交OM、ON于A、B点,若GH的长为10cm,求△PAB的周长为( )

A. 5cm B. 10cm C. 20cm D.15cm

7.如图,∠AOB的平分线上一点P到OA的距离为5,Q是OB上任意一点,则( )

A.PQ≥5 B.PQ>5 C.PQ≤5 D.PQ<5

B

Q

AO

第6题图 第7题图

第8题图

8.如图,在2³2的正方形网格中,有一个格点△ABC(阴影部分),则网格中所有与△ABC 成轴对称的格点三角形的个数为( )

A.2 B.3 C.4 D.

5

2017重庆出版社八年级寒假作业答案篇三

2016年八年级数学上册寒假作业答案

2016年八年级数学上册寒假作业答案

练习一

C C A C C B D B 30 3 4 4和6 16;25:08 80 5 2号

练习二

A C D C C B BBC,WWW 8 2 10 5 60 110

练习三

C B D C C A B B ⑷⑹⑺ ⑴⑵⑶⑸ 2/3 0.6 9.75*10^10 5或7 直角 10

练习四

B C D D D A D B -1/2 3 -5 3-2 2.03 100 3 5;8 15 (就是根号。)

练习五

C B C D D C C C C 90 一、口、王、田 经过平行四边形ABCD的对角线交点 AC=BD且ACBD 22cm与20cm 6 3 45 8

练习六

B C A B D A C D 线段、平行四边形、正方形、园 线段、角、正方形、等腰梯形、圆、等边三角形 线段、正方形、圆 90 AB=CD 80 2 28

练习七

D B C A A A A 有序实数对 13 3 (-3,-1) =3 -2 (1,2) (1,-3) (-3,-7)

练习八

B C A C B C (3,0) (0,1) (-6/7,9/7) y=x+3 s=264-24t -2 -1 y=x-3 y=1/3x-1/3 5 8 240

练习九

C B B D C C -1 9/2 y=3x+5 14 3 3 三 y=-x-1 一、二、四 减小 x y 8 x=2,y=7(自己用大括号) 5 120 15

练习十

D A D D B 95 203 101 8 8.1 9 9 3m+7 3n+7{2017重庆出版社八年级寒假作业答案}.

练习十一

A D B B C D C B 2 -2 3 25/8 4 (4,-3) y=-5/2x x=-1,y=2(自己用大括号) 9 6 4

2017重庆出版社八年级寒假作业答案篇四

2016-2017学年寒假作业(五)

2016-2017学年寒假作

业(五)

一.选择题(共13小题)

1.从数轴上看,0是( )

A.最小的整数 B.最大的负数 C.最小的有理数 D.最小的非负数

2.下列说法正确的是( )

A.规定了正方向和单位长度的射线叫做数轴

B.规定了原点、单位长度的线段叫做数轴

C.有正方向和单位长度的直线叫做数轴

D.规定了原点、正方向和单位长度的直线叫做数轴

3.在数轴上与表示﹣2的点相距5个单位长度的点所表示的数是( )

A.3 B.﹣7 C.7 D.3或﹣7

4.在数轴上,﹣1和1之间的有理数有( )

A.1个 B.2个 C.3个 D.无数个

5.在数轴上距原点2 013个单位长度的点表示的数是( )

A.2 013 B.﹣2 013

C.2 013或﹣2 013 D.1 006.5或﹣1 006.5

6.如图,数轴上a,b两点所表示的两数的商为( )

A.1 B.﹣1 C.0 D.2

7.下列四个有理数中,在原点左边的是( )

A.﹣2 014 B.0 C.15.8 D.

8.在数轴上,点A表示﹣8,线段AB在数轴上,若线段AB=20,则点B表示的数是(

A.12 B.﹣28 C.﹣12或28 D.12或﹣28

9.在数轴上与表示的点的距离最近的整数点所表示的数是( )

A.0 B.1 C.﹣1 D.

10.下列说法正确的是( )

A.在数轴上,离原点越远数就越大

B.在数轴上,离原点越远数就越小

C.都在原点右边的两数,离原点越远数就越大

D.都在原点左边的两数,离原点越远数就越大

11.下列图形中是数轴的是( )

A.

D. B. C.

12.在数轴上如果点a表示到原点距离等于5的数,则a+2等于( )

A.7 B.﹣7 C.﹣3 D.﹣3或7

13.m,n两数在数轴上的位置如图所示,下列结论正确的是( )

A.m+n>0 B.m﹣n>0 C.mn>0 D.|m|>|n|

二.填空题(共13小题)

14.从数轴上观察,大于﹣3且小于3的整数是3个单位长度的数是 .

15.如果数轴上A,B两点所表示的数分别是﹣5,1,那么线段A,B两点间的距离为,线段AB的中点所表示的数是 .

16.有理数a、b在数轴上的位置如图所示:化简|a﹣b|﹣(﹣a)﹣|b|=.

17.在数轴上﹣2.5与3.5的两点之间,表示整数的点有

18.数轴上表示﹣3的点到原点的距离是 个单位,到原点的距离等于5.5个单位的点表示的数是 .

19.在数轴上A表示﹣,点B表示,则点

20.利用数轴回答:

(1)写出所有小于4且大于﹣3的整数有 ;

(2)不小于﹣4的非正整数有 .

(3)绝对值小于5的所有整数 .

21.数轴上表示3的点到表示x的点的距离是2,则x的值为.

22.点M从数轴的原点开始,先向左移动3个单位长度,再向右移动2个单位长度,此时点M所表示的数是 .

23.在数轴上表示数2的点在原点 侧.

24.一个点从数轴上表示 的点开始,向右移动5个单位,到达表示3的点处.

25.如图所示,已知数轴上的点A,B,C,若点A表示的数为1,则点B表示的数为原点是 .

26.数轴上的点都表示有理数. .(判断对错)

三.解答题(共4小题)

27.把下列各数分别填在相应的集合里:

﹣1,,0.3,0,﹣1.7,21,﹣2,1.01001,+6,

(1)正数集合{ …}

(2)负数集合{ …}

(3)正整数集合{ …}

(4)分数集合{ …}.

28.既是正数又是分数,这样的数是什么数,举两例说明.

29.把下列各数填在相应的集合里.

﹣5,,2 010,0,﹣,+6.5,﹣10%,﹣0.123.

(1)正整数集合:{};

(2)负数集合:{};

(3)非负数集合:{};

(4)负分数集合:{};

(5)正数集合:{}.

30.有一位同学对老师说,因为像2,+2.37,…等正数是有理数,﹣1,﹣3,﹣6,…等负数也是有理数,同样0也是有理数,因此得出结论:有理数包括正数、0和负数.请问这位同学得出的结论是否正确?若不正确,请说明理由.

2017重庆出版社八年级寒假作业答案篇五

2016-2017年度七年级上册学期英语寒假作业(8份)

七年级英语寒假作业一

一、单项选择

( ) 1. There _______ a pen and two rubbers in the pencil box.

A. am B. is C. are D. be

( )2.What does she look like? She has ________________.

A. a long hair B. many long hairs C. long hair D. long hairs

( ) 3. ---_______ is your father? --- He‟s fine

A. How old B.How C. What D.Wh

( ) 4.---Boys and girls, please sit down . ----____________________.

A. That‟s OK B. NO. Stand up C. Thank you D. That‟s all right

( )5. Mum, _________ my friend Jane.

A. this‟s B. it is C. this is D. he is

( )6.--What‟s this ? --It‟s _______. ---What color is it? ---It‟s __________.

A. orange, an orange B. an orange, an orange

C. orange, orange D. an orange, orange

( ) 7. — Where ________ Millie and Lucy ________? — England.

A. is; come from B. do; from C. does; come from

( 8. _______are in the same class.{2017重庆出版社八年级寒假作业答案}.

A. You, he and I B. I, you and he C. You, I and he D. He, you and I

( ) 9.Jim, ________ play ________ in the street. It‟s dangerous.

A. doesn‟t, football B. doesn‟t, the football

C. don‟t, football D. don‟t, the football

( )10. —Do you want to play basketball with us? — ________.

A. You‟re welcome B. Thank you very much

C. No, I don‟t think so D. Yes, I‟d love to.

二、完型填空

Sally and Tom are from England but now they live in Nanjing. They study at No.1 Middle School. They are

in the same grade, but in different Their classes begin eight a.m. They have Chinese, Maths and English lessons in the morning. In the

afternoon they have some lessons like Art, Music and P.E. They can English very well, but they aren‟t at Chinese. Miss Yang, their Chinese teacher often helps them their Chinese. They study hard at their lessons.

They both like Chinese culture (文化). Sally likes Chinese drawing and Tom enjoys Chinese Music.

After school they often their classmates. Their classmates are friendly to them. They say they learn

from their teachers and classmates at school. They love their teachers and classmates. They also love their

( )1.

( )2.

( )3.

( )4.

( )5. A. classes A. in A. others A. speak A. bad B. schools B. at B. else B. talk B. well C. lessons C. on C. other C. say C. good D. subjects D. of D. other‟s D. tell D. nice D. are; from{2017重庆出版社八年级寒假作业答案}.

( )6.

( )7.

( )8.

( )9.

( )10.

三、阅读理解 A. in A. listening A. play A. a lot A. home B. with B. hearing B. chat B. a lot of B. family

A C. about C. listening to C. talk C. many C. school D. on D. hearing from D. play with D. lots of D. clothes

My favourite sport is basketball because it is very exciting. I like basketball because the NBA stars play very well. Basketball is very cheap and it is a good sport for our health. We can grow taller if we play basketball often. Also it keeps me fit. I play basketball three times a week. Most often I play it in my school. I often play it with my friends or I may play it myself. I feel very happy when I play basketball at school with my classmates. Sometimes I play basketball in the playground near my home. Basketball is very easy to play. If you play basketball very well, you can form a basketball team to take part in the competition. If you win the basketball competition, you will have the prize. You may become a famous basketball star.

( )1. I like basketball best because it‟s _______.

A. cheap B. good C. exciting D. famous

( )2. How many times do I play basketball every week?

A. five B. three C. four D. six

( )3. I often play basketball _________.

A. with my parents B. with my friends C. with my cousins D. myself

( )4. Why do I like basketball?

A. Because it‟s cheap B. Because it‟s good for health

C. Because the NBA stars play very well D. A, B and C

( )5. The beat title for the passage is _________.

A. Basketball player B. My favourite sport

C. Basketball star D. My favourite basketball star

B

Li Ping gets up early on weekdays, because he must go to school before 7:30. On Saturday and Sunday, he doesn‟t go to school, so he doesn‟t get up early.

He goes to the Drawing Club at 9:00 on Saturday mornings. He usually goes to the bookshop on Saturday afternoons, and after supper he watches TV until (直到) midnight.

He doesn‟t get up early on Sundays. Li Ping‟s parents both work on Sundays. Li Ping always watches TV after he gets up. Then he usually goes to KFC to have a hamburger and some juice for lunch. After that, he goes back home and starts to play football until his parents come back. He does his homework after supper. He usually has lots of weekend homework, so he must do it for three hours. He usually goes to bed at about 11:00 p.m. on Sundays. He often complains (抱怨) he has too much homework to do.

( )6. How often does Li Ping need to get up early?

A. Every day. B. Five days a week.

C. Only at the weekend. D. Every day except on Sundays.

( )7. What does Li Ping do on Sunday mornings?

{2017重庆出版社八年级寒假作业答案}.

A. He goes to have lessons. B. He watches TV.

C. He goes to the bookshop. D. He goes to a club.

( )8. When does Li Ping do his weekend homework?

A. On Sunday evenings. B. On Sunday mornings.

C. On Saturday evenings. D. On Sunday afternoons.

( )9. Why does Li Ping have lunch in KFC on Sundays?

A. Because he‟s too busy. B. Because his parents aren‟t at home.

C. Because he gets up too late. D. Because his parents have lunch in KFC.

( )10. Which of these is not right?

A. Li Ping doesn‟t exercise on Sundays.

B. Li Ping watches TV after supper on Saturdays.

C. Li Ping watches too much TV on Saturdays and Sundays.

D. Li Ping goes to bed late on Saturday and Sunday evenings.

四、任务型阅读 (共l0空;每空l分,计l0分)

阅读下列短文,根据短文中的信息完成文后表格。(每空一词)

Hi! Do you know the three children? They are in a happy family. Xiao Xue is a

helpful girl. She is beautiful. She likes study. She studies very hard. She gets up early

and finishes her breakfast quickly. Then she goes to school by bike. Liu Xing is a

little lazy. He gets up late and then washes his face, brushes his teeth in a hurry. Then

he goes to the bus stop without breakfast. He usually plays basketball after school. In

the evening, he seldom does homework. He goes to bed late. Xiao Yu is a lovely boy.

He gets up very slowly and then he usually takes a shower before breakfast. He goes to school in his father‟s car. He

五、词汇 根据句意和所给提示,填写正确的单词。

1. Kitty loves___________(dance). She practices it every day.{2017重庆出版社八年级寒假作业答案}.

2. Jimmy wears ___________(glass). He looks cool.

3. The girl dances very (good).

(shop) with you?

{2017重庆出版社八年级寒假作业答案}.

5. He is good at ____________ (swim).

6. What colour ____________ (be) her new trousers?

7. Would you like ___________ (have) something to drink?

8. Lisa (go) to school with her sister every day

9. Let him (meet) my teacher, Mr. Wang.

10. I am __________(高兴的) to meet my new friend, Jim.

11. My mother is very (苗条) and beautiful.

12. ___________(每一个人) likes Mr. Zhou‟s English lessons.

13. My (梦想) is to be a good teacher in the future

14. The little girl looks very (讨人喜欢的).

15. Andy wants to join the Football ).

{2017重庆出版社八年级寒假作业答案}.

六、短文填词

David is eight. One day his friend Rose to him, "This Sunday is my birthday. Can you come to my es".

mother says, "Yes, you can go, but you food. They will give you some." "All right, Mum." David answers and he his bike.

for some time, and then Rose's mother gives them she forgets David. He waits and waits and then he takes his plate up and asks, "Do you want a plate?"

七、书面表达根据以下提示,以“My best friend ”为题,写一篇60 字左右的短文。

(1)我的好朋友Lucy,15岁, 来自美国,在7年级3班。

(2)个子高且苗条,黑色短发。 (3)爱好打排球。

(4)擅长游泳和绘画等;在学校有许多新朋友。 (5)老师和同学们都很喜爱她。

七年级英语寒假作业二

命题:张梦秋 审核:孙 飞

一、单项选择

( ) 1. --_______ do they go to see their teachers? --Every year.

A. How long B. When C. How often D. How much time

( ) 2. The boy, _______ his father, _______ fishing.

A. like; likes B. likes; likes C. likes; like D. like; like

( ) 3. He never_______ a hat even if (即使) it is in winter.

A. wears

A. and

A. OK B. be in C. in D. puts on ( ) 4. The bike is very old, _______ he likes it very much. B. but C. so C. no D. because D. really

D. /; /

D. about; to

D. are win ( ) 5. --Good news! We will have a party this Friday afternoon. --Oh, _______? B. all right ( )6. My friend Bob likes to play_______ football after_______ lunch. A. the; the B. /; the A. to; to C. the; / ( ) 7. --Who does Millie talk_______ animals_______?--Her classmates. B. about; about C. to; about B. wins C. can win ( ) 8. I hope you_______ the game. A. will to win

A. do ( ) 9. You are so busy. What do you want me_______ for you? B. does C. to do D. doing

( )10.--_______ the girls enjoy_______ this film?--Yes, they______.

A. Does; watching; does B. Do; watching; do C. Do; watch; do D. Does; watch; does

( )11. My father_______ free. He can't play_______ me now.

A. doesn't; to B. isn't; to C. doesn't; with D. isn't; with

( )12. The boy draws very_______, so the picture looks very_______.

A. good; beautiful B. good; beautifully C. well; beautifully D. well; beautiful

( )13. Playing computer games_______ a lot of_______.

A. are; funs B. is; fun C. are; fun D. is; funs

( )14. Everyone_______ here. Let's_______ our class.

A. is; begin B. are; to begin C. is; to begin D. are; begin

( )15. He is_______ the Music Club. He_______ music.

A. on; enjoy listening B. on; enjoys listenning to C. in; enjoies D. in; enjoys listening to

( )16. --What_______ does he have in his schoolbag? --_______ money.

A. other; Many B. others; Lots C. else; Lot of D. else; A lot of

( )17. Her classmates_______ her. And she_______ likes them.

A. like all; too B. all like; also C. like all; also D. all like; too

( )18. Linda with her parents_______ Shandong.

A. live in B. lives in C. to live D. are living

( )19. He doesn't look_______ today. We must_______ him.

A. well; look after

A. Yes, we do

二、完形填空

B. good; looks for C. well; looks at D. good; look like B. Sorry, we don't C. No, I don't D. Good idea ( )20. --Let's fly kites! -- _______.

2017重庆出版社八年级寒假作业答案篇六

2017年八年级寒假数学作业(1)

八年级数学寒假作业(1)

1.下列各数:1.34,-,

π, 0.020020002„„, 6.57896,是无理数的是( ) 2

A. 2个 B. 3个 C. 4个 D. 5个 2.16的平方根是( )

A. ±4 B. -4 C. 4 D. ±2

3.某青年排球队12名队员的年龄情况如下: 则这个队队员年龄的众数和中位数是( ). A.19,20 B.19,

C.19,20.5 D.20,19

4.下列各式中, 已经化简的是 ( )

3

A. 1 B. 20 C. 22 D. 121

5.如图:在△ABC中,若∠A=65°¸∠1=115°,则∠B的度数是( )。

A. 40 B. 50 C. 60 D.70. 6.以方程组

yx2

的解为坐标的点(x,y)在平面直角坐标系中的位置是( )

yx1

A.第一象限 B.第二象限 C.第三象限 D.第四象限

7.刘翔在出征雅典奥运会前刻苦进行110米跨栏训练,教练对他10次的训练成绩进行统计分析,判断他的成绩是否稳定,则教练需要知道刘翔这10次成绩的( ) A.众数 B.方差 C.平均数 D.频数 8.《九章算术》中记载一个这样的问题“五只雀、六只燕,共重1斤(等于16两),雀重燕轻,互换其中一只,恰好一样重,问:每只雀、燕的重量各为多少?”如果设雀重x两,燕重y两,根据题意列出方程组正 确的是( ) A.

B.

C.

D.

9、下列四个命题中,真命题有( )

①两条直线被第三条直线所截,内错角相等. ②三角形的外角大于内角

③如果∠1和∠2是对顶角,那么∠1=∠2. ④0.3,0.4,0.5是一组勾股数. A.1个 B.2个 C.3个 D.4个

10. 已知一次函数ykxk,若y随着x的增大而减小则该函数的图像经过:( ) A.第一、二、三象限 B.第一、二、四象限 C.第二、三、四象限 D.第一、三、四象限 二.填空题:(每题4分,共24分) 11. 点P(-3,4)到x轴的距离是__________,到原点的距离是 。 12.已知直角三角形的两直角边长分别为

,则斜边上的高为

13.已知一次函数ykx5与直线y为 。

1

x的图象平行,则这个一次函数表达式2

14.如右图,AB∥CD,BC∥DE,若∠B=50°,则∠D的度数 。

15.某校对甲、乙两名跳高运动员的近期跳高成绩进行统计分析,结果如下:x甲1.69m,

22

x乙1.69m,S甲0.0006,S乙0.00315,则这两名运动员中 的成绩更稳定;

16.如图,圆柱的底面周长为6cm,AC是底面圆的直径,高BC=6cm,点P是BC上一点,且PC=

2

BC。一只蚂蚁从A点出发沿着圆柱体的表面爬3

行到点P的最短距离是

三、解答题(17—19题每题6分,20—22题每题7分,23—25题每题9分,共66分) 17.化简:

19. 假期中,小明和同学们到某海岛上去探宝旅游,按照探宝图,他们登陆后先往东走8

千米,又往北走2千米,遇到障碍后又往西走了3千米,再折向北走了6千米处往东一拐,仅走了1千米就找到宝藏,问登陆点A到宝藏埋藏点B的直线距离是多少千米?

20、如图,已知AB∥CD,∠A =100,CB平分∠ACD,求∠ACD、∠ABC的度数。

21.

列方程组解应用题:医院用甲、乙两种原料为手术后的病人配制营养品.每克甲原料

728

4x3y5

231231 18.解方程组:

x2y4



含0.5单位蛋白质和1单位铁质,每克乙原料含0.7单位蛋白质和0.4单位铁质.若病人每餐需要35单位蛋白质和40单位铁质,那么每餐甲、乙两种原料各多少克恰好满足病人的需要?

22、已知A、B两地相距100千米,甲、乙两人骑自行车分别从A,B两地相向而行.假设他们都保持匀速行驶,则他们各自到A地的距离s(千米)都是骑车时间t(时)的一次函数,其中甲乙两人s与t之间的关系的图像如右图:

(1)l1表示哪辆汽车到A地的距离与行驶时间的关系? (2)汽车乙的速度是多少?

(3)求l1,l2分别表示两辆汽车的S与t的关系式。 (4)行驶多长时间后,A、B两车相遇?

23.八年级数学科老师在一次“探究性学习”课中,给出如下数表:

(1)请你分别认真观察线段a、b、c的长与n之间的关系,用含n(n为自然数,且n>1)的代数式

表示: a= b= c=

(2)猜想:以线段a、b、c为边的三角形是否是直角三角形?

并说明你的结论。

24. 如图,直线AB与x轴交于点A(1,0),与y轴交于点B(0,﹣2).

(1)求直线AB的解析式;

(2)若直线AB上的点C在第一象限,且S△BOC=2,求点C的坐标. 25、(1)、已知,如图(a),直线AB∥ED。

求证:∠ABC+∠CDE=∠BCD。 (2)、已知,如图(b),直线AB∥ED,请你猜想∠ABC、∠CDE、∠BCD的关系是:

(3)、已知,如图(c),直线AB∥ED,请你猜想∠ABC、∠CDE、∠BCD的关系是:

(4)已知,如图(d),直线AB∥ED,请你猜想∠ABC、∠CDE、∠BCD的关系是:

(5)已知,如图(e),直线AB∥EF,若∠B=30º,∠D=70º,∠E=20º,则∠C= 度。

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