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nguyenthihaanh.qng2017
2 năm trước
Một ca nô xuôi dòng từ bến A đến bến B mất 4h và ngược dòng từ B đến A mất 6h. Tính khoảng cách AB, biết vận tốc dòng nước là 3km/h. Giair theo dạng toán thực tế nha mấy b
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