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数学7上：同时打开三根水管几分钟把水池注满？解方程蓄水池问题
数学7上：同时打开三根水管几分钟把水池注满？解方程蓄水池问题
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341/581
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