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数学7上：求木桶中水的深度是多少？如何结合实际，找等量关系？
数学7上：求木桶中水的深度是多少？如何结合实际，找一元一次方程等量关系？
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180/581
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