求積分高人解答。
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P.S.要有式
求積分高人解答(20點)
2010-09-30 5:56 am
回答 (3)
2010-10-09 1:59 am
✔ 最佳答案
(1) The anti-derivative fn. of exp(-x^2/2) cannot be expressed as fundamental fns.(2) It can be denoted by a special fn. erf(x)=(2/√π)∫[0~x] exp(-t^2) dt.
(3) ∫exp(-x^2/2) dx (set u=x/√2)
=∫ exp(-u^2) (√2) du
= √2 erf(u)+C= √2 erf(x/√2)+C
2010-10-06 4:48 am
謝謝﹗謝謝﹗謝謝﹗謝謝﹗
2010-09-30 10:41 am
你的式是否欠缺了dx?
謝謝!
謝謝!
收錄日期: 2021-04-13 17:33:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100929000051KK01525