在数列1,1,2,3,5,8,x,21,34,55中,x等于( )
A. 11
B. 12
C. 13
D. 14
人气:391 ℃ 时间:2019-08-20 20:23:33
解答
∵数列1,1,2,3,5,8,x,21,34,55 设数列为{an}
∴an=an-1+an-2 (n>3)
∴x=a7=a5+a6=5+8=13
故选C
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