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Physics, 20.10.2021 21:20 Eric0393nsuh

Một ngừơi đi xe đạp trên 2/3 đoạn đừơng đầu với vận tốc trung bình 10km/h và 1/3 đoạn đừơng sau với vận tốc trung bình 20km/h. Vận tốc trung bình của ngừơi đi xe đạp trên cả quảng đừơng là

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Một ngừơi đi xe đạp trên 2/3 đoạn đừơng đầu với vận tốc trung bình 10km/h và 1/3 đoạn đừơng sau với...

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