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（遵义专版）2019中考数学高分一轮复习第一部分教材同步复习第一章数与式课时4二次根式真题在线.doc

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1第一部分 第一章 课时 4命题点一 二次根式有意义的条件1(2015遵义)使二次根式 有意义的 x 的取值范围是_ x _.5x 225【解析】根据题意，得 5x20，解得 x .25命题点二 二次根式的运算2(2018遵义)计算 1 的结果是_2_.9【解析】原式312.3(2017遵义) _3 _.8 2 2【解析】原式2 3 .2 2 24(2016遵义)计算 的结果是_2 _.2 18 2【解析】原式 3 2 .2 2 2

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