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sarasara
2 năm trước
hai thư viện đựng tất cả 20.000 cuốn sách nếu chuyển từ thư viện một sang thư viện 2000 cuốn sách thì số sách ở thư viện 1 và thư viện 2 bằng nhau , tính số sách mỗi thư viện lúc đầu Giải bằng gọi x ở thư viện thứ 2
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