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数学7上：一道应用题，较复杂顺水和逆水，又包含相遇和追及问题
数学7上：一道一元一次方程行程问题应用题，较复杂顺水航行和逆水航行问题，又包含相遇和追及问题
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199/581
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