(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)

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(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001

(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)

(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
=(-2011/2012)*(-2010/2011)*(-2009/2010)*.*(-1000/1001)*(-999/1000)
=999/2012


原式
=(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
=-(1-1/1000)(1-1/1001)(1-1/1002)......(1-1/2002)
=-999/1000*1000/1001*1001/1002.....2001/2002
=-999/2002

应该是负值才对
原式
=(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
=-(1-1/1000)(1-1/1001)(1-1/1002)......(1-1/2012)
=-999/1000*1000/1001*1001/1002.....2011/2012
=-999/2012

137343389回答是错误的
最后的结果是-999/2012