(1/2010-1)*(1/2009-1)*（1/2008-1）.*(1/1000-1)
=(-2009/2010)*(-2008/2009)*(-2007/2008)*...*(-999/1000)
=(-1/2010)*(-999)
=999/2010
=333/670
怎么算(2010/1-)*(2009/-1)*(2008/1-1)*…(1000/1-)=?
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