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（2，3）怎么会是空集 2.1不是吗？

Posted by 515363446 at 2014-07-10 14:44:55 on Problem 3225 and last updated at 2014-07-10 14:45:21
In Reply To:我不明白结果不应该是空集吗？怎么会是（2,3） Posted by:0912230011 at 2014-03-07 15:01:46 
集合包括小数
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