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数学7上：怎么求购进电风扇多少台？一元一次方程，商品销售问题
数学7上：怎么求购进电风扇多少台？一元一次方程，商品销售问题
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309/581
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