某自然数a是3的倍数,a-1是4的倍数,a-2是5的倍数,则a最小为( )?A. 57 B. 37 C. 117 D. 27

作者: tihaiku 人气: - 评论: 0
问题 某自然数a是3的倍数,a-1是4的倍数,a-2是5的倍数,则a最小为( )?
选项 A. 57 B. 37 C. 117 D. 27
答案 A
解析 本题考查余数同余问题。代入验证,57,117符合题意,但是要找的是最小的,应选择57

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