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ngocuuvox
2 năm trước
các bạn chỉ mình với hứa sẽ vote 5 sao :(( lúc 6h sáng, một ô tô khởi hành từ A để đến B. Đến 7h30', ô ôt thứ 2 khởi hành từ A với vận tốc lớn hơn vật tốc ô tô thứ nhất là 20km/h.Hai xe gặp nhau lúc 10h30'.Tính vận tốc mỗi xe.
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