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2 năm trước
Bài 5: Đoạn đường AB dài 54 km. Xe chuyển động từ A đến B với tốc độ 36 km/h. Khi đến B, xe lập tức chuyển động về A mất 45 phút. a/. Tính thời gian đi từ A đến B. b/. Tính tốc độ chuyển động trên đoạn đường từ B về A. c/. Tính tốc độ trung bình trên cả quãng đường đi và về. -giúp e vs gần nộp bài r
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