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2022-08-10 15:34:43
vì n là số nguyên suy ra n chia hết cho 3 chia 3 dư 1 hoặc chia 3 dư 2 nên n chỉ có thể là 3k+1,3k+2 hoặc 3k .nếu n = 3k+3 thì n sẽ tg tự với 3k vì chia hết cho 3