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数学7下：已知x+y)²=25，(x-y)²=9，怎么求xy和x²+y²的值？
七年级数学：已知x+y)²=25，(x-y)²=9，怎么求xy和x²+y²的值？
初中数学，完全平方公式，基础训练，培优专题18/139
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