1/2.1/4,1/6,1/8,1/10...第n个是 1,3,5,7,9,11...第m个是

问题描述:

1/2.1/4,1/6,1/8,1/10...第n个是 1,3,5,7,9,11...第m个是

1/2.1/4,1/6,1/8,1/10.1/(2n)
1,3,5,7,9,11...2m-1第一题为什么是1/(2n)呢,谢谢2 4 6 810 都是双数啊 正好是2倍