(123456+234561+345612+456123+561234+612345)/62008/2009又1/2007+1/2008
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(123456+234561+345612+456123+561234+612345)/62008/2009又1/2007+1/2008
(123456+234561+345612+456123+561234+612345)/6
2008/2009又1/2007+1/2008
(123456+234561+345612+456123+561234+612345)/62008/2009又1/2007+1/2008
(123456+234561+345612+456123+561234+612345)/6
=(1+2+3+4+5+6)*111111/6
=21*111111/6
=777777/2
=388888.5
2008/2009又1/2007+1/2008
=2008*2007/(2009*2007+1)+1/2008
=2008*2007/2008^2+1/2008
=2007/2008+1/2008
=1
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