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数学7上：队伍尾跑到队伍前是追及问题，再回到队伍尾是相遇问题
数学7上：队伍尾跑到队伍前是追及问题，再回到队伍尾是相遇问题，理解这个是关键。
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222/581
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