Physics, 18.06.2021 04:20, espiritu9632

Đi từ x đến y với vận tốc đi bộ là 5km/h , quay lại thì vận tốc là 6km/h . Tính vận tốc bình quân chung

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Đi từ x đến y với vận tốc đi bộ là 5km/h , quay lại thì vận tốc là 6km/h . Tính vận tốc bình quân ch...