(1/2010-1)*(1/2009-1)*(1/2008-1).(1/1001-1)*(1/1000-1)
问题描述：
(1/2010-1)*(1/2009-1)*(1/2008-1).(1/1001-1)*(1/1000-1)
答
=(-2009/2010)(-2008/2009)(-2007/2008).(-1000/1001)(-999/1000)
=-999/2010