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Tueminh88
2 năm trước
2 xe ô tô cùng khởi hành cùng 1 lúc từ 2 tỉnh a và b cách nhau 360km. nếu đi ngược chiều thì 2 xe gặp nhau sau 4h tính vận tốc của mỗi xe biết rằng xe đi từ a nhanh hơn xe kia 10km mỗi giờ
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