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|1/2011-1/2010|-|1/2012-1/2010|+|1/2012-1/2011|=?
人气:327 ℃ 时间:2019-12-09 03:14:01
解答
|1/2011-1/2010|-|1/2012-1/2010|+|1/2012-1/2011|
=1/2010-1/2011-1/2010+1/2012+1/2011-1/2012
=0
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