-2,4,-8,16,-32,64; 0,6,-6,18,-30,66; -1,2,-4,8,-16,32; 找规律,写出n个数 ;找出关
问题描述:
-2,4,-8,16,-32,64; 0,6,-6,18,-30,66; -1,2,-4,8,-16,32; 找规律,写出n个数 ;找出关
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答
-2,4,-8,16,-32,64;an=(-2)^n
0,6,-6,18,-30,66;an=? 确定题目没错?
-1,2,-4,8,-16,32;an=-(-2)^(n-1)