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hathusontrang
2 năm trước
một tủ sách gồm 2 ngăn lúc đầu số sách ngăn trên so với ngăn dưới là 3/4 sau khi thêm 30 quyển sách vào ngắn dưới thì số sách ngắn trên so với số sách ngắn dưới là 10/9 . Tính số sách mỗi ngăn lúc đầu
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