(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1):;;;;;;;;;;*(1/2006-10
问题描述:
(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1):;;;;;;;;;;*(1/2006-10
::;;;是省略号
答
(1/2-1)*(1/3-1)*(1/4-1)*(1/5-1):;;;;;;;;;;*(1/2006-1)
=(-1/2)*(-2/3)*(-3/4)*.*(-2005/2006)进行约分,且一共为奇数项
=-1/2006