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haiyen090
2 năm trước
Đoạn đường AB dài 180km . Cùng 1 lúc xe máy đi từ A và oto đi từ B. Xe máy gặp oto tại C cách A 80km . Nếu xe máy khởi hành sau oto 54p thì chúng gặp nhau tại D cách A là 60km . Tinh vận tốc oto và xe máy
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