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数学7上：甲、乙合作3天，剩下的由乙独做，共需要多少天完成？
数学7上：甲、乙合作3天，剩下的由乙独做，共需要多少天完成？
七年级数学，一元一次方程应用题，各种类别的题型，这里都有详解428/581
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