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nguyenhachi
2 năm trước
Bài 3: (1,0 điểm) Một tủ sách có 3 ngăn chứa 345 quyền sách. Số quyển sách trong ngăn thứ nhất bằng 1/3 số quyển sách ở ba ngăn; số quyển sách trong ngăn thứ hai bằng 80% số quyền sách ở ngăn thứ nhất. Tính số quyển sách ở mỗi ngăn. giúp em vs ạ...................................
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