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原来如此，唉，还是学的太死了。。。In Reply To:Re:那就给个简单推导吧 Posted by:zhzz at 2008-09-01 09:00:43 > 公式推错了吧。。。E(X^2)=D(X)+E(X)^2 > 的确牛人~~~当时怎么就死活没想到呢。。。 Followed by: Post your reply here: |
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