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nhimxinh.17122005
2 năm trước
Một chiếc tàu thủy đi từ A đến B hết 10/3 giờ, lúc về ngược gió nên đi nhiều hơn lúc đi là 5/3 giờ. Biết vận tốc dòng nước là 4km/h. Tính vận tốc lúc đi, lúc về và quãng đường AB ?
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