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tranthuhuyen1005
2 năm trước
Lúc 8h sáng, một chiếc ca nô xuôi dòng từ bến A đến bến B, cách nhau 36km, rồi ngay lập tức quay trở về và đến bến A lúc 12h30’. Tính vận tốc lúc ca nô xuôi dòng, biết vận tốc dòng nước là 6km/h.
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