计算:|1/2009-1/2008|-|1/2010-1/2008|+|1/2010-1/2009|

问题描述:

计算:|1/2009-1/2008|-|1/2010-1/2008|+|1/2010-1/2009|

=(1/2008-1/2009)-(1/2008-1/2010)+(1/2009-1/2010)
=1/2008-1/2009-1/2008+1/2010+1/2009-1/2010
=0