求解答!!谢谢

2025-02-24 09:11:08
推荐回答(1个)
回答1:

4、(1)=1/n-1/(n+1)
(2)=1-1/2+1/2-1/3+1/3-1/4.....+1/n-1/(n+1)
=1-1/(n+1)