观察下列一组数-2/3,4/5,-6/7,8/9,-10/11,12/13...第n个数为
问题描述:
观察下列一组数-2/3,4/5,-6/7,8/9,-10/11,12/13...第n个数为
答
=(-1)^n×(2n)/(2n+1)
观察下列一组数-2/3,4/5,-6/7,8/9,-10/11,12/13...第n个数为
=(-1)^n×(2n)/(2n+1)