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火车过桥问题：七年级数学一元一次方程应用题行程问题培优训练
火车过桥问题，火车过隧道问题，都是属于这一类问题。车头上桥，车尾离桥，时间X速度=桥长+车长
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240/581
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