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nguyentuan_2108
2 năm trước
giải bài toán bằng cách lập pt một ca nô xuôi dòng từ bến A đến bến B mất 6 h và ngược dòng từ bến B về bến A mất 7 h. tính khoảng cách giữa 2 bến A và B,biết rằng vận tốc của dòng nước là 2km/h
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