(山西专用)2019中考数学一轮复习第一单元数与式第4讲二次根式优选习题.doc

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1、1第 4讲 二次根式基础满分 考场零失误类型一 二次根式及其相关概念1.(2018扬州)(3 分)使 有意义的 x的取值范围是 (A)-3A.x3 B.x3 C.x3 D.x32.(2018兰州)(4 分)下列二次根式中,是最简二次根式的是(A)A. B. C. D.18 13 27 123.(2018聊城)(3 分)下列实数中的无理数是(A)A. B.1.21 3-8C. D.3-32 2274.(2018河北)(3 分)- 的相反数是 . 5类型二 二次根式的运算5.(2018太原三模)(3 分)下列计算正确的是(A)A. =2 B.2 =612 6 3 3C. + = D. =28 2

2、10 3-86.(2018湖北武汉)(3 分)计算( + )- 的结果是 . 3 2 37.(2018山西预测)(3 分)2 -3 = . 27 38.(2018临沂)(3 分)计算:|1- |= . 29.(2018青岛)(3 分)计算:2 -1 +2cos 30= . 12210.(2018乌鲁木齐)(8 分)计算: - +| -2|+2sin 60.(12)-13-8 3能力升级 提分真功夫11.(2018聊城)(3 分)下列计算正确的是(A)A.3 -2 =10 5 5B. =711(117 111)11C.( - ) =27515 3 5D. -3 =1318 89212.(2018

3、绵阳)(3 分)使等式 = 成立的 x的取值范围在数轴上可表示为(A)-3+1 -3+113.(2018乌鲁木齐)(3 分)计算 6 -10 的结果是 . 51514.(2018潍坊)(3 分)用教材中的计算器进行计算,开机后依次按下 3x2=,把显示结果输入如下的程序中,则输出的结果是 . 预测猜押 把脉新中考15.(2019原创预测)(3 分)若 + +1在实数范围内有意义,则 x满足的条件是(A)3-1 1-33A.x B.x13 13C.x= D.x13 1316.(2019改编预测)(3 分)把二次根式 a 化简后,结果正确的是(A)-1A. B.- -C.- D. 17.(2019改编预测)(3 分)如果 =1-2a,则 a的取值范围为 . (2-1)218.(2019原创预测)(5 分)计算:-1 2 +2 - +sin 60.27 12(12)-14答案精解精析基础满分1.C 2.B 3.C 4.答案 55.B 6.答案 27.答案 3 38.答案 -129.答案 2 310.解析 原式=2-(-2)+2- +2 =6.332能力升级11.B 12.B 13.答案 4 514.答案 7预测猜押15.C 16.B 17.答案 a1218.解析 原式=-13 +22 -2+ =-3 +4 -2+ = -2.3 3323 332332

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