题目内容
计算:![]()
解:原式=2-2´
+1 ···························· 3分
=2-
+1························· 5分
=3-
·························· 6分
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题目内容
计算:![]()
解:原式=2-2´
+1 ···························· 3分
=2-
+1························· 5分
=3-
·························· 6分