(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))

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(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))

(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))
(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))

(1/2009-1)*(1/2008-1)*(1/2007-1)……(1/3-1)*(1/2-1))
1/2009 错项相消

1/2009