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tranhaiyen
2 năm trước
xét tập E gồm các số tự nhiên , mỗi số đều có 5 chữ số xếp theo thứ tự không giảm và tập các chữ số của nó là {1;3;5;7} a mô tả tập E bằng cách liệt kê các phần tử của nó b gọi n là số lớn nhất trong tập E biểu diễn n thành tổng giá trị các chữ số của nó
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