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dqmgbeo
2 năm trước
lúc 6h sáng, một người đi máy khởi hành từ A chuyển động với v=36 km/h đi về B. Cùng lúc một người đi xe đạp chuyển động với vận tốc 12km/h xuất phát từ B đến A. Khoảng cách AB=108 km. Hai người gặp nhau lúc mấy giờ
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