按规律填空:-2,4,-8,16,-32,64,···第n个数是多少?
问题描述:
按规律填空:-2,4,-8,16,-32,64,···第n个数是多少?
答
(-1)的n次方*2的n次方=(-2)的n次方.
(-2)的n次方即为第n个数.