裂项法计算1/1×2+1/(1+1)×(2+1)+……+1/(1+2006)×(2+2006)

问题描述:

裂项法计算
1/1×2+1/(1+1)×(2+1)+……+1/(1+2006)×(2+2006)

[1-1/2]+[1/(1+1)-1/(2+1)]+……+[1/(1+2006)-1/(2+2006)]
=1-1/2008=2007/2008