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thucoi243
2 năm trước
Ví dụ 2: Một ca nô xuôi khúc sông dài 40 km rồi ngược khúc sông ấy hết 4 giờ rưỡi. Biết thời gian ca nô xuôi 5 km bằng thời gian ca nô ngược 4 km. Tính vận tốc dòng nước.
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