题目内容
计算：
解：原式
······················································································ （5分）
．………………………（6分）略
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．
________=（
________）2.
．
。
的平方根是 
没有平方根
的平方根是
．
计算：
解：原式
······················································································ （5分）．………………………（6分）
的值.（6分）