云南省2018年中考数学总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第一章 数与式好题随堂演练1(2018武汉)计算( ) 的结果是_3 2 32计算: ( )_2 8 23(2017淮安)下列式子为最简二次根式的是( )A. B.5 12C. D.a21a4(2018曲靖)下列二次根式中能与 2 合并的是( )3A. B.813C. D.18 95(2018邵阳)用计算器依次按键 ,得到的结果最接近的是( )3A1.5 B1.6 C1.7 D1.86(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7计算: .24 3 6 3参考答案1. 2.223A 4.B 5.C 6.C7解:原式 8 182 32 25 .2

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