(完整)七年级下册《实数》单元测试卷(2)

(完整)七年级下册《实数》单元测试卷(2)
(完整)七年级下册《实数》单元测试卷(2)

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班级 _______ 姓名 ________ 坐号 _______ 成绩 _______

一、选择题(每小题3分,共30分)

1、若x 是9的算术平方根,则x 是( )

A 、3

B 、-3

C 、9

D 、81

2、下列说法不正确的是( )

A 、251的平方根是15

± B 、-9是81的一个平方根 C 、0.2的算术平方根是0.04 D 、-27的立方根是-3

3、若a 的算术平方根有意义,则a 的取值范围是( )

A 、一切数

B 、正数

C 、非负数

D 、非零数

4、在下列各式中正确的是( )

A 、2)2(-=-2

B 、=3

C 、16=8

D 、22=2

5、估计76的值在哪两个整数之间( )

A 、75和77

B 、6和7

C 、7和8

D 、8和9

6、下列各组数中,互为相反数的组是( )

A 、-2与2)2(-

B 、-2和38-

C 、-2

1与2 D 、︱-2︱和2 7、在-2,4,2,3.14, 327-,5

π,这6个数中,无理数共有( ) A 、4个 B 、3个 C 、2个 D 、1个

8、下列说法正确的是( )

A 、数轴上的点与有理数一一对应

B 、数轴上的点与无理数一一对应

C 、数轴上的点与整数一一对应

D 、数轴上的点与实数一一对应

9、以下不能构成三角形边长的数组是( )

A 、1,5,2

B 、3,4,5

C 、3,4,5

D 、32,42,52

10、若有理数a 和b 在数轴上所表示的点分别在原点的右边和左边,则2

b -︱a -b ︱等于( )

A 、a

B 、-a

C 、2b +a

D 、2b -a 二、填空题(每小题3分,共18分)

11、81的平方根是__________,1.44的算术平方根是__________。

12、一个数的算术平方根等于它本身,则这个数应是__________。

13、38-的绝对值是__________。

14、比较大小:27____42。

15、若36.25=5.036,6.253=15.906,则253600=__________。

16、若10的整数部分为a ,小数部分为b ,则a =________,b =_______。

三、解答题(每题5分,共20分)

17、327-+2)3(--31- 18、33364

631125.04

1027-++---

求下列各式中的x

19、4x 2-16=0 20、27(x -3)3=-64

四、(每题6分,共18分)

21、若5a +1和a -19是数m 的平方根,求m 的值。

22、已知a 31-和︱8b -3︱互为相反数,求(ab )-2-27 的值。

23、已知2a-1的平方根是±3,3a+b-1的算术平方根是4,求a+2b的值。

五、(第23题6分,第24题8分,共14分)

24、已知m是313的整数部分,n是13的小数部分,求m-n的值。

25、平面内有三点A(2,22),B(5,22),C(5,2)

(1)请确定一个点D,使四边形ABCD为长方形,写出点D的坐标。

(2)求这个四边形的面积(精确到0.01)。

(3)将这个四边形向右平移2个单位,再向下平移求平移后四个顶点的坐标。

人教版七年级数学第十章《实数》测试卷

参考答案

一、1、A ;2、C ;3、C ;4、D ;5、D ;6、B ;7、C ;8、D ;9、D ;10、B

二、11、9,1、2 ; 12、1,0;13、2;14、<;15、503、6;16、a =3,b =10-3 三、17、1;18、-411

;19、x =±2;20、35

四、21、256;22、37 23、9

五、24、5-13;25、(1)、D (2;2),(2)、s =32≈4、24;(3)、

A '(4;-2)

B '(7;-2)

C '(7;-22)

D '(4;-22)

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