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tiepwinhchun
2 năm trước
Số sách của thư viện lớp 6A có khoảng từ 100 đến 200 quyển sách. Biết rằng khi xếp thành bó 4 quyển, 5 quyển, 6 quyển đều thiếu một quyển nhưng khi xếp thành bó 7 quyển thì vừa đủ. Tính số sách của thư viện lớp 6A.
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