(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/2-1)等于多少

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(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/2-1)等于多少(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/

(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/2-1)等于多少
(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/2-1)等于多少

(1/2009-1)*(1/2008-1)*(1/2007-1)*.*(1/3-1)*(1/2-1)等于多少
=2008/2009*2007/2008*2006/2007*……*2/3*1/2(分子分母都约掉了)
=1/2009

-2008/2009 * -2007/2008 * -1/2 =1/2009

原式=1/2009