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初中数学：若a²+b²=10，a+b=4，求a-b的值？完全平方公式经典题
初中数学：若a²+b²=10，且a+b=4，求a-b的值？完全平方公式经典题
初中数学，完全平方公式，基础训练，培优专题29/139
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