|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+.+|1/2006-1/2004|

问题描述:

|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+.+|1/2006-1/2004|

=1/2-1/2006
=501/1003