=1/2003-1/2004+1/2002-1/2003+1/2001-1/2002-1/2000+1/2001
=2/2001-1/2004-1/2000
化简：|1/2004-1/2003|+|1/2003-1/2002|+|1/2002-1/2001|-|1/2001-1/2000|
化简：|1/2004-1/2003|+|1/2003-1/2002|+|1/2002-1/2001|-|1/2001-1/2000|
数学人气：421 ℃时间：2020-04-23 03:44:20
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