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数学7上：当x=300，怎么设计一种最省钱的方案？方案抉择问题
数学7上：当x=300，怎么设计一种最省钱的方案？方案抉择问题
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33/581
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