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行程问题，追及问题公式，速度差×时间=追及距离，是怎么来的？
数学7上：一元一次方程应用题，行程问题中，追及问题公式，速度差×时间=追及距离，是怎么来的？
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149/581
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