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第一个不是数学期望最基础的意义吗

Posted by 3xian at 2008-08-31 23:02:49 on Problem 3682 and last updated at 2008-08-31 23:03:08
In Reply To:其实知道了第一个求第二个好办,但是第一个怎么算呢?难道是凭感觉。。。 Posted by:wrbuaa2005 at 2008-08-31 22:50:21


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