(广西专用)2019中考数学一轮新优化复习第一部分教材同步复习第一章数与式第5讲二次根式真题精选.doc

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(广西专用)2019中考数学一轮新优化复习第一部分教材同步复习第一章数与式第5讲二次根式真题精选.doc_第1页
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1第一部分 第一章 第 5 讲命题点 1 二次根式的概念与性质(2018 年 3 考,2017 年贺州考,2016 年 6 考)1(2018北部湾经济区 13 题 3 分)要使二次根式 在实数范围内有意义,则实数x 5x 的取值范围是_ x5_.2(2016玉林、防城港、崇左 15 题 3 分)要使代数式 有意义,则 x 的最大值1 2x是_ _.123(2016贺州 13 题 3 分)要使代数式 有意义,则 x 的取值范围是_ x1 且x 1xx0_.命题点 2 二次根式的运算及估值(2018 年 2 考,2017 年 2 考,2016 年 4 考)4(2017贵港 4 题 3 分)下列二次根式中,最简二次根式是( A )A B 2 12C D15 a25(2016来宾 8 题 3 分)下列计算正确的是( B )A B3 2 65 3 2 5 3 15C(2 )316 D 12336(2016桂林 6 题 3 分)计算 3 2 的结果是( A )5 5A B2 5 5C3 D657(2016北海 15 题 3 分)计算:( )2 016( )2 016_1_.2 3 2 38(2018河池 13 题 3 分)计算: _3_.92 29(2018柳州 19 题 6 分)计算:2 3.4解:原式437.

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