8,11,13,17,20,( ) A. 18 B. 20 C. 25 D. 28

作者: rantiku 人气: - 评论: 0
问题 8,11,13,17,20,( ) A. 18 B. 20 C. 25 D. 28
选项
答案 C
解析 本题为二级数列。8 11 13 17 20 (25) 两两相加 19 24 30 37 (45) 两两相减 5 6 7 (8)这是一个以5为首项的等差数列。故答案为C。
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