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初中数学：若ab+bc+ca=-3，且a+b+c=0，怎么求a4+b4+c4的值？
初中数学：若ab+bc+ca=-3，且a+b+c=0，怎么求a4+b4+c4的值？
初中数学，完全平方公式，基础训练，培优专题101/139
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