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数学7上：同时打开三根水管，几分钟把水池注满？如何画图理解？
数学7上：同时打开三根水管，几分钟把水池注满？如何画图理解？
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396/581
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