(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)*(1/1000-1)尽快!

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(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)*(1/1000-1)尽快!(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)

(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)*(1/1000-1)尽快!
(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)*(1/1000-1)
尽快!

(1/2006-1)(1/2005-1)(1/2004-1)...(1/1001-1)*(1/1000-1)尽快!
=-2005/2006*(-2004/2005)*……*(-1000/1001)*(-999/1000)
=-999/2006