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小升初数学：怎么求AB两地的距离？甲乙丙行程问题，巧用比例方程
小升初数学：怎么求AB两地的距离？甲乙丙行程问题，如何巧用比例方程，是解题的思路关键。
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261/581
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