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火车问题常见考题，怎么求火车的车长？一元一次方程，培优考题
火车问题常见考题，怎么求火车的车长？一元一次方程，怎么找等量关系？培优考题。
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89/581
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