福建省2019年中考数学复习第一章数与式第二节二次根式好题随堂演练.doc

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1第二节 二次根式好题随堂演练1(2017淮安)下列式子为最简二次根式的是( )A. B. C. D.5 12 a21a2(2018曲靖)下列二次根式中,能与 2 合并的是( )3A. B. C. D.813 18 93(2018扬州)使 有意义的 x 的取值范围是( )x 3Ax3 Bx3 Cx3 Dx34(2018上海)计算 的结果是( )18 2A4 B3 C2 D.2 25下列计算正确的是( )A2 B. 12 2 2 3 5C4 3 1 D32 53 3 2 26(2018无锡)下列等式正确的是( )A( )23 B. 33 ( 3) 2C. 3 D( )2333 37(2018重庆 B 卷)估计 5 的值应在( )6 24A5 和 6 之间 B6 和 7 之间C7 和 8 之间 D8 和 9 之间8(2018龙岩质检)使代数式 有意义的 x 的取值范围是 x 29(2018白银)使代数式 有意义的 x 的取值范围是 1x 310(2018烟台) 与最简二次根式 5 是同类二次根式,则 a 12 a 111(2018武汉)计算( ) 的结果是 3 2 312计算:5 2 813计算: ( ) 2 8 214计算: .24 3 6 32参考答案1A 2.B 3.C 4.C 5.A 6.A 7.C8x2 9.x3 10.2 11. 12.3 13.2 14.52 2 2

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