281 201 131 71 ( ) -21 A. 31 B. 41 C. 11 D. 21

作者: rantiku 人气: - 评论: 0
问题 281 201 131 71 ( ) -21 A. 31 B. 41 C. 11 D. 21
选项
答案 D
解析 这是一道等差数列变式题,将原数列最后一位数“1”去掉,可以得到一个新的数列:28,20,13,7,(),-2。新数列是一个二级等差数列,中间括号内填2。再还原成原始数列,2后面应该添上1,即为21。所以选D。

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