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数学7上：优惠卡问题，问直接付款是多少元？一元一次方程应用题
数学7上：优惠卡问题，问直接付款是多少元？一元一次方程应用题
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362/581
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