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thptlp12a1
2 năm trước
Một ca nô xuôi dòng trên khúc sông AB hết 4 giờ và đi ngược khúc sông đó hết 6 giờ. Biết vận tốc dòng nước là 3km/giờ. Tính vận tốc của ca nô khi dòng nước lặng.
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