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luuvanbac15
2 năm trước
một ca nô chạy thẳng đều xuôi dòng từ bến a đến bến b hết 2h, ngược dòng hết 3h. vận tốc của ca nô với nước là 40km/h . tính : khoảng cách AB , vận tốc của dòng nước. giúp mình với mình cần gấp ạ..
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