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两支粗细不同的蜡烛，怎么求停电时间？一元一次方程，培优经典题
两支粗细不同的蜡烛，怎么求停电时间？一元一次方程，培优经典题
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378/581
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