1x2分之1+2x3分之1+3x4分之1+.+2006x2007分之1=
1x2分之1+2x3分之1+3x4分之1+.+n(n+1)分之=
人气:295 ℃ 时间:2020-08-30 07:47:48
解答
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.(1/2006-1/2007)
=1-1/2007
=2006/2007
推荐
- |109/1-110/1|+|110/1-111/1|-|109/1-111/1
- 初中作业难吗?语文,数学,英语,那个难
- 今天我们数学老师出差了结果换了个老师那老师讲的课我们班没几个听懂的.
- 某项工程甲乙两人合作,8天可以完成,需要费用3520元;若甲单独做6天后,剩下的由乙做,还需12天才能完成,需要费用3480元.问:1.甲、乙两人单独完成此项工程,各需多少天?2.甲、乙两人单独完成此项工程,各需费用多少元?
- time_____,we will visit some other interesting places
- The desk has two d_____ and there are some books in them. Your r_____is big and bright.
- 16. This is military _________, and no body is allowed to get in without permission.
- 应接不暇的近义词是什么
猜你喜欢