> 其他 >
1/2+1/6+1/12+1/20+1/30+.+1/110=?
人气:320 ℃ 时间:2020-02-20 15:00:37
解答
1/2+1/6+1/12+1/20+1/30+.+1/110
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+……+1/10-1/11
=1-1/11
=10/11
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版