Bài 2. Một xe chuyển động thẳng không đổi chiều, trong nửa thời gian đầu xe chạy với vận tốc 24km/h. Trong nửa thời gian sau xe chạy với vận tốc 36km/h. Tính tốc độ trung bình trong suốt thời gian đi

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