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数学火车过桥问题：什么时候桥长加车长？什么时候桥长减车长？
火车过桥问题：什么时候桥长加车长？什么时候桥长减车长？听方老师认真讲解这类数学题
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233/581
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