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八年级数学：分式化简求值，a是方程x²+3x+1=0的根，整体代入法
八年级数学：分式化简求值，a是方程x²+3x+1=0的根，整体代入
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246/333
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