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八年级数学：已知x+x(-1)=3，怎么求下列三个式子的值？分式培优
八年级数学：已知x+x(-1)=3，怎么求下列三个式子的值？分式培优
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57/333
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