我要提问:  

问题
数字推理题目.

-7,0,1,2,9,()
a.12 b.18 c.24 d.28
答案
28

an=(n-3)^3+1

a1=(1-3)^3+1=-7
a2=(2-3)^3+1=0
a3=(3-3)^3+1=1
a4=(4-3)^3+1=2
a5=(5-3)^3+1=9
所以
a6=(6-3)^3+1=28
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