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tomboy_girl25
2 năm trước
lúc 8h sáng một ô tô đi từ A->B với vận tốc 45km/h sau đó 1h một xe máy đi từ B ->A với vận tốc 30km/h đến 10h 30p thì hai xe gặp nhau tính chiều dài AB
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