(1-1/3)*(1-1/4)*(1-1/5)*……*(1-1/2009)*2009=?找规律,巧计算

问题描述:

(1-1/3)*(1-1/4)*(1-1/5)*……*(1-1/2009)*2009=?找规律,巧计算

(1-1/3)*(1-1/4)*(1-1/5)*……*(1-1/2009)*2009
=(2/3)*(3/4)*(4*5)*.*(2008/2009)*2009
=2*(3/3)*(4/4)*.*(2009/2009)
=2