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分母:(23-5)/(4-1)=6 分子:6+23=29 所以這個數是29/6 或者設未知數 設分母為x,分子為y 由題意得 x+23=y 4x+5=y 所以x+23=4x+5 x=6 y=x+23=6+23=29 即這個假分數是29/6
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