选B,规律如下:隔项相减的差,成等差数列!
7-1=6
11-1=10
21-7=14
29-11=18
数列1,1,7,11,21 ,A:27 B:29 C:32 D:36 答案是什么,
数列1,1,7,11,21 ,A:27 B:29 C:32 D:36 答案是什么,
数学人气:987 ℃时间:2020-03-29 21:11:53
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