|1/2014-1/2013|+|1/2013-1/2012|+|1/2014-1/2012|
=1/2013-1/2014+1/2012-1/2013+1/2012-1/2014
=1/1006 -1/1007
=1/1013042
|1/2014-1/2013|+|1/2013-1/2012|+|1/2014-1/2012|
|1/2014-1/2013|+|1/2013-1/2012|+|1/2014-1/2012|
数学人气:245 ℃时间:2019-11-10 22:57:45
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