不对
应该是2/2008-1/2009-1/2007
如果中间是加号,则=1/2009-1/2007=-4016/4032063
|1/2009-1/2008|-|1/2008-1/2007| =1/2008-1/2009-1/2007+1/2008 =-1/2009-1/2007 =-4016/4032063
|1/2009-1/2008|-|1/2008-1/2007| =1/2008-1/2009-1/2007+1/2008 =-1/2009-1/2007 =-4016/4032063
其他人气:181 ℃时间:2020-06-02 20:49:27
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