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初中数学：实数ab满足这个等式，怎么求根号(a-b)²的值？常考题
初中数学：实数ab满足这个等式，怎么求根号(a-b)²的值？常考题
实数，无理数，平方根，立方根，二次根式，常考题培优专练248/419
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