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数学7上：多少小时后两车相距600千米？为什么只讨论一种情况？
数学7上：多少小时后两车相距600千米？为什么只讨论一种情况？一元一次方程应用题，追及问题。
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250/581
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