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thuphuongvlcm
2 năm trước
Bài 1 :có 2 ngăn sách số sách ở ngă thứ nhất gấp ba lần số sách ở ngăn thứ hai nếu chuyển 20 quyển sách từ ngăn thứ nhất sang ngăn thứ 2 thì 2 ngăn bằng nhau tính số sách ban đầu các bạn giúp mình vs
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