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Bài giải:
Tủ thứ nhất hơn tủ thứ hai số sách: 48 : 3/4 = 64 ( quyển )
Số quyển sách lúc đầu của tủ thứ nhất: ( 664 + 64 ) : 2 = 364 ( quyển )
Số quyển sách lúc đầu của tủ thứ hai: 364 – 64 = 300 ( quyển )
Đáp số: 300 quyển.
Ko chắc đâu ạ!
![](https://rs.olm.vn/images/avt/0.png?1311)
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