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数学7上：甲商品实际售价是多少元？间接设元，如何找等量关系？
数学7上：甲商品实际售价是多少元？间接设元，如何找等量关系？
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445/581
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