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初中数学：怎么求a²+1/a²，和a4+1/a4的值？完全平方公式常考题
初中数学：怎么求a²+1/a²，和a4+1/a4的值？完全平方公式常考题
初中数学，完全平方公式，基础训练，培优专题103/139
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