计算:(1/2014-1)*(1/2013-1)*(1/2012-1)*.*(1/1001-1)*(1/1000-1)
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计算:(1/2014-1)*(1/2013-1)*(1/2012-1)*.*(1/1001-1)*(1/1000-1)
计算:(1/2014-1)*(1/2013-1)*(1/2012-1)*.*(1/1001-1)*(1/1000-1)
计算:(1/2014-1)*(1/2013-1)*(1/2012-1)*.*(1/1001-1)*(1/1000-1)
=(-2013/2014)*(-2012/2013)*……*(-1000/1001)*(-999/1000)
2014-1000+1=15
=-999/2014