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Mathematics, 14.06.2021 17:30 spellsaltoniza

Một phòng họp có 180 người được xếp đều trên các dãy ghế. Nếu thêm 80 người thì phải kê thêm 2 dãy ghế và mỗi dãy ghế tăng thêm 3 người. Hỏi lúc đầu phòng họp đó có bao nhiêu dãy ghế ?

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Một phòng họp có 180 người được xếp đều trên các dãy ghế. Nếu thêm 80 người thì phải kê thêm 2 dãy g...

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