(123456+234561+345612+456123+561234+612345)/62008/2009又1/2007+1/2008
问题描述:
(123456+234561+345612+456123+561234+612345)/6
2008/2009又1/2007+1/2008
答
(123456+234561+345612+456123+561234+612345)/6=(1+2+3+4+5+6)*111111/6=21*111111/6=777777/2=388888.52008/2009又1/2007+1/2008=2008*2007/(2009*2007+1)+1/2008=2008*2007/2008^2+1/2008=2007/2008+1/2008=1...