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Re:这个题目我没有理解错吧，为什么我算不出0.972这个值呢In Reply To:这个题目我没有理解错吧，为什么我算不出0.972这个值呢 Posted by:hopeztm at 2011-11-27 19:03:12 算发错了，两个事件并不独立，不能直接相乘 Followed by:
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