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family27042011
2 năm trước
một cano chạy xuôi dòng một khúc sông từ a đến b dài 80km và tại b cano dừng lại 30 phút sau đó chạy ngược dòng khúc sông ấy để trở về a mất tất cả 9h30 rồi tính vận tốc riêng của cano bt vận tốc dòng nước là 2km/h
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