观察下面一列数字:1,-3,5,-7,9,-11,13……照此规律,第n个数是(
问题描述:
观察下面一列数字:1,-3,5,-7,9,-11,13……照此规律,第n个数是(
答
[(-1)^(n+1)]*(2n-1)
观察下面一列数字:1,-3,5,-7,9,-11,13……照此规律,第n个数是(
[(-1)^(n+1)]*(2n-1)