1,6,5,7,2,8,6,9()括号中填啥呢?
问题描述:
1,6,5,7,2,8,6,9()括号中填啥呢?
答
答案是3
a(n)=a(n-1)-a(n-2) n=2k,k>0
5=6-1
2=7-5
6=8-2
()=9-6