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anhtchien0510
2 năm trước
một vòi nước chảy vào một cái bể không có nước. biết bể này chứa 14000 lít nước. giờ đầu được 1/4 bể. giờ sau chảy gấp đôi giờ thứ nhất. hỏi bể cần bao nhiêu lít nước thì đầy bể
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