1/2008表示2008分之1;其它相同
2008÷2009又1/2007+1/2008
=2008÷(2009×2007+1)/2007+1/2008
=(2008×2007)/(2009×2007+1)+1/2008
=(2008×2007)/[(2008+1)(2008-1)+1]+1/2008
=(2008×2007)/(2008＾2-1＾2+1)+1/2008
=(2008×2007)/2008＾2+1/2008
=2007/2008+1/2008
=2008/2008
=1