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八年级数学：若a²+b²+c²=1，怎么求 a+b+c的值？分式培优拓展
八年级数学：若a²+b²+c²=1，怎么求 a+b+c的值？分式培优拓展
八年级数学：分式的定义和化简，解分式方程，应用题，培优专题280/333
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