>
数学
>
计算:1/a(a+1)+1/(a+1)(a+2)+...+1/(a+2006)(a+2007)
快啊,等着救命聂!
人气:459 ℃ 时间:2020-07-28 22:57:16
解答
裂项:1/a(a+1)=1/a-1/(a+1)
1/a(a+1)+1/(a+1)(a+2)+...+1/(a+2006)(a+2007)
=1/a-1/(a+1)+1/(a+1)-1/(a+2)+...+1/(a+2006)-1/(a+2007)
=1/a-1/(a+2007)
推荐
计算:{1/a(a+1)}+{1/(a+1)(a+2)}+{1/(a+2)(a+3)}+…+{1/(a+2006)(a+2007)}+{1/(a+2007(a+2008)}
计算:1/[a(a+1)]+1/[(a+1)(a+2)]+1/[(a+2)(a+3)+...+1/[(a+2006)(a+2007)]
动动脑筋: 2006+2007×20052006×2007−1.
计算(1^2-2^2/1+2)+(2^2-3^2/2+3)+(3^2-4^2/3+4)+.+2006^2-2007^2/2006+2007
计算1/{a(a+1)}+1/{(a+1)(a+1)}+{(a+2)(a+3)}+.+1/{(a+2005)(a+2006))}
Without you?I would be a soul without a purpose.求这句话的出处
250万吨等于多少吨
课堂上,老师给大家出了这样一道题:"已知5a-2x+3=0,4b-7x-21=0
猜你喜欢
1.按规律填空:32、25、64.5、129、( )、516
1/n+1/(n+d)+1/(n+2d)+.+1/[n+(k-1)d]+1/(n+kd)=?n为已知量,d为等差中项
迅龙翻译成英文怎么写?这个词是不是没有单词的,要靠组合吗?可以翻译作为商标用途的英文要怎么写?
用that ,which ,where 填空:1、This the factory ____ his father used to work .
求定积分:∫ f(x) dx.上限2,下限1.已知∫ f(t/2)dt=e^(-1/x^2)-e^(-1/2)
do you suggest怎么用?
he considered that gouvernment was most important这句话是不是错了啊,gouvernment和most前少冠词
关于自然之道的故事
© 2024 79432.Com All Rights Reserved.
电脑版
|
手机版