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数学七下：怎么求a²+b²+c²-ab-bc-ac的值？配方法运用基础训练
数学七下：怎么求a²+b²+c²-ab-bc-ac的值？配方法运用基础训练
初中数学，完全平方公式，基础训练，培优专题80/139
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