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thuha5711gd
2 năm trước
Một cuốn tài liệu có 200 trang, giáo viên nhờ 1 học sinh lật giở từng trang và đánh số trang liên tục từ 1 đến 200. Hỏi học sinh đó phải đánh tất cả bao nhiêu chữ số?
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