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Một oto chạy trên đường thẳng. Trên nửa đầu quãng đường, oto chạy với vận tốc không đổi bằng 50km/h. Trên nửa quãng đường còn lại, oto chạy với vận tốc không đỏi bằng 60km/h . Tính tốc độ trung bình của oto trên cả quãng đường.
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