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初中数学：怎么求m²+n²和(m-n)²的值？完全平方公式，熟练掌握
初中数学：怎么求m²+n²和(m-n)²的值？完全平方公式，基础常考题
初中数学，完全平方公式，基础训练，培优专题115/139
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