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chicuonguyen
2 năm trước
Tổng số vở của 2 ngăn sách là 90 quyển. Nếu chuyển ngăn sách thứ 2 sang ngăn thứ 1 10 quyển thì số vở ở ngăn sách thứ nhất sẽ gấp đôi. Tìm số vở mở mỗi ngăn sách lúc đầu
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