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kieuhue3005
2 năm trước
Các phòng học đều được lắp số quạt trần như nhau. Biết 10 phòng học lắp 40 cái quạt trần. Hỏi muốn lắp 25 phòng học cần bao nhiêu chiếc quạt trần ? A. 80 chiếc B. 90 chiếc C. 100 chiếc D. 1000 chiếc
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