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phuonguyen082004
2 năm trước
Quãng đường AB dài 400km. Một ô tô đi từ A đến B với vận tốc không đổi. Khi từ B trở về A, ô tô tăng vận tốc thêm 10km/h so với lúc đi từ A đến B. Biết rằng tổng thời gian đi và về của ô tô là 18 giờ. Tính vận tốc lúc đi của ô tô
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