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xiuheo906
2 năm trước
1 chiếc cano đi dọc 1 con sông, xuôi theo dòng nước từ A đến B mất 2h và đi ngược dòng mất 3h. HỎi nếu người ta tắt máy để cho cacno trôi theo dòng nước thì nó trôi từ A đến B mất bao nhiêu thời gian
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