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blackpink.csp.t.12
2 năm trước
Câu 3:(2,0 đ) Một ca nô xuôi dòng từ bến A đến bến B mất 5 giờ, nếu đi ngược dòng từ bến B về bến A mất 7 giờ, trong khi dòng nước chày với vận tốc là 4 km/h. Tính độ dài khoảng cách giữa hai bến A và B. help meeeeeeeeeeeeeeeeeeeeeee
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