> 其他 >
求和:1/1×2+1/2×3+1/3×4+……+1/n(n+1)
人气:394 ℃ 时间:2020-04-08 06:36:35
解答
1/1×2+1/2×3+1/3×4+……+1/n(n+1)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/n-1/(n+1))
=1-1/(n+1)
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版