拆开做
1/(80*81)=1/80-1/81
即公式是
1/(N+1)*N=1/N-1/(N+1)
会了吧?其实知道方法后很简单的.
结果你自己算算吧!
一个数学题:1/(80*81)+1/(81*82)+……+1/(99*100)
一个数学题:1/(80*81)+1/(81*82)+……+1/(99*100)
数学人气:720 ℃时间:2020-01-29 20:03:21
优质解答
我来回答
类似推荐
猜你喜欢
- 1好雨知时节用了什么修辞手法
- 2哪些字是由火旁和土旁组成的字?
- 3He doesn't know_English because he has studied(已经学习)it for only_weeks. A.much,a few B.few,little C.a few,little
- 4tke matter is consideration and the result will come out tomorrow
- 5已知sinx=负的根号5cosx,a为第二象限角,求tanx,sinx,cosx的值
- 6I love everything about you,especially the way you made me feel how special I am.
- 7英语作文对于自己的介绍
- 8i don't think he can swim,can he 这个句子是对的吗?还有,那个如果加一个反义疑问句,
- 9it was sunday the day before yesterday
- 10线段AB有一个点,G,M是AB的中点,N是AC的中点,若AB等于16AC等于10则M与N的距离是