(1-1/2)(1/3-1)(1-1/4)(1/5-1)``````(1/2009)(11/2010)

问题描述:

(1-1/2)(1/3-1)(1-1/4)(1/5-1)``````(1/2009)(11/2010)

(1-1/2)(1/3-1)(1-1/4)(1/5-1)``````(1-1/2009)(1-1/2010)
=½×2/3×3/4×4/5x—-×2008/2009×2009/2010
=1/2010