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八年级数学：已知a=b+2018，怎么求值？分式先化简，整体代入法
八年级数学：已知a=b+2018，怎么求值？分式先化简，整体代入法
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228/333
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