某自然数加10或减10,都是完全平方数,则这个自然数是()。A. 25 B. 26 C. 28 D. 29

作者: tihaiku 人气: - 评论: 0
问题 某自然数加10或减10,都是完全平方数,则这个自然数是()。
选项 A. 25 B. 26 C. 28 D. 29
答案 B
解析 直接代入可知,26-10=42,26+10 = 62,本题选B。
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