2019中考数学一轮复习第一部分教材同步复习第一章数与式第2讲数的开方与二次根式权威预测.doc

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1第一部分 第一章 第 2 讲1当 x_ _时,二次根式 有意义12 2x 12计算:(2 ) _11 _.1213 6 2

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