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两个车间加工，共需多少天？每个车间各加工几个？一元一次方程
数学7上，两个车间加工，共需多少天？每个车间各加工几个？一元一次方程工程问题。
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402/581
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