(1/2012-1)*(1/2011-1)*(1/2010-1).*(1/1000-1)

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(1/2012-1)*(1/2011-1)*(1/2010-1).*(1/1000-1)

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

-999/2012