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nhinhiiiiiiiiiiiiiii
2 năm trước
trong một cuộc thi chạy 10 km . An đến đích trước Bình 2 km và đến trước Cường 4 km . Nếu vận tốc của mỗi người vẫn giữ nguyên thì Bình sẽ về đích trước Cường bao nhiêu ki lô mét ?
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