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hungvu1142005
2 năm trước
Một phòng học có 100 chỗ ngồi, nhưng số người đến họp là 156 người.Do đó,người ta phải kê thêm 2 dãy ghế và mỗi dãy ghế phải them 3 người ngồi.Hỏi phòng họp lúc đầu có mấy dãy ghế?
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