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1、实数单元测试题一选择题(每小题 3 分,共 39 分)120.7的平方根是()A0.7 B 0.7 C 0.7 D 0.492.在-1.414,2,3.14,2+3,3.14 这些数中,无理数的个数为().A.5 B.2 C.3 D.4 3.已知下列结论:在数轴上只能表示无理数;任何一个无理数都能用数轴上的点表示;实数与数轴上的点一一对应;有理数有无限个,无理数有有限个.其中正确的结论是().A.B.C.D.4.若225a,3b,则 ab()A8 B8 C2 D 8 或2 5.下列说法中,不正确的是()A 3 是2)3(的算术平方根 B3 是2)3(的平方根C 3 是2)3(的算术平方根 D.
2、3 是3)3(的立方根6.若 a、b 为实数,且满足 a2+2b=0,则 ba 的值为()A2 B0 C2 D 以上都不对7.若aa2)3(-3,则a的取值范围是().A.a3 B.a3 C.a3 D.a3 8若 2m-4与 3m-1是同一个数的平方根,则m的值是()A-3 B1 C-3 或 1 D-1 9.已知一个直角三角形的两边长分别为3 和 4,则第三边长是()A5 B25 C7D5 或710.以下列各组数为边的三角形中,是直角三角形的有()(1)3,4,5;(2)3,4,5;(3)32,42,52;(4)0.03,0.04,0.05 A1个 B2 个 C3 个 D4 个11已知 RtA
3、BC中,C=90,若 a+b=14cm,c=10cm,则 RtABC的面积是()A.24cm2B.36cm2 C.48cm2 D.60cm2 12.若225a,3b,则ab()A8 B 8 C 2 D 8 或 2 13.如图 7,已知在 RtABC中,RtACB,4AB,分别以 AC,BC 为直径作精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 1 页,共 3 页半圆,面积分别记为1S,2S,则1S+2S的值等于二填空(每空 2 分,共 30 分)142(4)的平方根是;64的立方根是;15在数轴上表示3的点离原点的距离是。1612的相反数是 _,绝对值是 _17若102.0
4、110.1,则1.0201=。18若一个数的立方根等于它的算术平方根,则这个数是。19.绝对值小于18的所有整数20已知1)12(2ba=0,则-20042ba=_.21如果 2180a,那么a的算术平方根是22等腰三角形的腰长为5,底边长为 8,则它底边上的 高为_,面积为 _ _ 23若3378a,则a的值是24.在 ABC 中,C=90,AB 5,则2AB+2AC+2BC=_25直角三角形两直角边长分别为5 和 12,则它斜边上的高为 _26、如图,所有的四边形都是正方形,所有的三角形都是直角三角形,其中最大的正方形的边和长为7cm,则正方形 A,B,C,D的面积之和为 _cm2.三解答
5、题(51 分)26求 x 值(每题 5 分)(1).16461)21(3x (2)126942x 27 计算:(每题 5 分)(1)16+327+33-2(3)(2)3331513432782125(3)30.125;(4)31804;28一个正数 x 的平方根是2a3 与 5a,则 a 是多少?A B C D 第18题图7cm 精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 2 页,共 3 页文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2
6、G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N1
7、0W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK
8、9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M
9、10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 Z
10、H7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6
11、J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档
12、编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4C A B D E 10 15 29、写出所有适合下列条件的数(每小题5 分,共 10 分)(1)大于17小于11的所有整数;(2)小于18的所有正整数。30、22585425225,即225225;即33103310;猜想:5526等于什么,并通过计算验证你的猜想。30(10 分)如如图,一架2.5 米长的梯子AB,斜靠在一竖直的墙AC上,这时梯足
13、 B到墙底端 C的距离为 0.7 米,如果梯子的顶端沿墙下滑0.4 米,那么梯足将向外移多少米?31(10 分)如图,铁路上A、B两点相距 25km,C、D为两村庄,若 DA=10km,CB=15km,DA AB于 A,CB AB于 B,现要在 AB上建一个中转站 E,使得 C、D两村到 E站的距离相等.求 E应建在距 A多远处?精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 3 页,共 3 页文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2
14、G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N1
15、0W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK
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17、10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 Z
18、H7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6
19、J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4文档编码:CS2G8M1N10W6 HK9F4M8M10V4 ZH7Y2L6J3K4
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