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八年级数学：已知x²+1=3x，怎么求x²-x-2的值？分式经典常考题
八年级数学：已知x²+1=3x，怎么求x²-x-2的值？分式经典常考题型
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148/333
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