化解啊 为1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9******2008/2009=1/2009 化解前面一个的分母可以和后面一个的分子相消,到最后就剩下2009分之一了
(1-2/1)x(1-3/1)x(1-4/1)x(1-5/1)x...x(1-2009/1)=
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