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七年级数学应用题：火车过桥为什么要桥长加车长？很多同学不懂
七年级数学应用题：火车过桥为什么要桥长加车长？在什么情况下路程等于桥长加车长？什么情况下路程就等于桥长？什么情况下路程等于桥长减车长？
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237/581
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