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数学七下：x+y=4，xy=1，怎么求(x²+1)(y²+1)的值？整体代入
数学七下：x+y=4，xy=1，怎么求(x²+1)(y²+1)的值？整体代入
初中数学，完全平方公式，基础训练，培优专题85/139
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