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作者 Ycosmos 在 PTT [ Math ] 看板的留言(推文), 共12則

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Re: [微積] 一題高微

[ Math ]1 留言, 推噓總分: +1

作者: Eliphalet - 發表於 2015/05/26 23:48(9年前)

1^F推Ycosmos: 感謝!!05/27 01:52

Re: [微積] 一題積分

[ Math ]2 留言, 推噓總分: +2

作者: MathforPhy - 發表於 2012/10/19 23:10(11年前)

1^F推Ycosmos:感謝!!!!剛剛一直算也沒結果果然板上高手多10/19 23:46

2^F推Ycosmos:中間 -ru= v-z^2+r^2 是不是有錯10/20 18:22

[微積] 一題積分

[ Math ]1 留言, 推噓總分: 0

作者: Ycosmos - 發表於 2012/10/19 22:58(11年前)

1^F→Ycosmos:提示說用partial fractions可以做出來但不知怎麼下手10/19 23:00

Re: [微積] 一題積分 int(x^2*exp(-a*x^2),-inf,inf)

[ Math ]6 留言, 推噓總分: +3

作者: profyang - 發表於 2012/10/15 23:50(11年前)

2^F推Ycosmos:感謝喔我剛剛改令u值果然可以了10/15 23:54

Re: [微積] 一題積分 int(x^2*exp(-a*x^2),-inf,inf)

[ Math ]7 留言, 推噓總分: +3

作者: MathforPhy - 發表於 2012/10/15 23:23(11年前)

1^F推Ycosmos:感謝原PO10/15 23:24

[微積] 一題積分 int(x^2*exp(-a*x^2),-inf,inf)

[ Math ]16 留言, 推噓總分: +5

作者: Ycosmos - 發表於 2012/10/15 22:53(11年前)

2^F→Ycosmos:我有試過但還是很奇怪10/15 22:56

4^F→Ycosmos:∫e^(-a*x^2)dx=(π/a)^0.5 這裡有用到極座標10/15 23:08

6^F→Ycosmos:可以問一下"積分內微分"是什麼意思嗎10/15 23:13

10^F→Ycosmos:抱歉我發現打得太簡略又補上一些式子了10/15 23:26

12^F→Ycosmos:所以...才來這裡問大家嘛就是因為怪怪的10/15 23:33

14^F→Ycosmos:感謝s大剛剛試了一下部分積分令u=x一樣可以做出來10/15 23:46

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