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lethithuna2018
2 năm trước
Một tàu thủy chạy trên khúc sông dài 80km ,cả đi và về hết 8 giờ 20 phút .Biết vận tốc dòng nước là 4km/giờ .Tính vận tốc tàu thủy khi nước yên nặng.
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