因为1/2006＞1/2007＞1/2008＞1/2009所以|1/2007-1/2006|+|1/2008-1/2007|-|1/2008-1/2006|=(1/2006-1/2007)+(1/2007-1/2008)-(1/2006-1/2008)=1/2006-1/2007+1/2007-1/2008-1/2006+1/2008=0题目应该是|1/2007-1/200...