[數撚圍爐區] 全港最多A0的POST上線啦 (32)

1001 回覆
5 Like 7 Dislike
2020-04-07 17:52:34
2020-04-07 17:54:22
2020-04-07 17:55:21
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2020-04-07 17:58:30
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2020-04-07 18:13:58


2020-04-07 18:16:39
2020-04-07 18:23:42
2020-04-07 18:26:00
自膠都係錯

呢個先岩
十世冇做過double indefinite integral

因為indefinite唔可以factorize 所以我第一步就做錯咗
2020-04-07 18:28:46
2020-04-07 18:41:36
https://lih.kg/oNxmMxX

同我犯咗一個問題 就係indefinite唔可以factorize
突然記起當年讀math2023都犯過呢個錯
但科野只考definite integral

解釋:
2020-04-07 18:46:25
2020-04-07 18:49:39
係呀 x同y嘅 integration boundary同埋integrand都係independent
所以呢種可以拆開計
如果你之後讀stat 你會好經常用呢招
2020-04-07 19:13:48
2020-04-07 19:27:44
其實我都唔肯定
因為我地正常計都係計definite(iterated integral) 就冇咁多問題
https://en.wikipedia.org/wiki/Iterated_integral

只肯定如果只take partial integral wrt y 而唔係double integral
C_1 is any differentible function of x

但如果真係寫C_1 is any differentible function of x
咁再int dx果陣就唔識int, int C_1(x) dx 會出d乜冇人知

BTW轉order係得definite integral先可以轉 (Fubini's theorem)
2020-04-07 20:09:26
M1嚟? 好似見過呢條數
assume: 唔可以重複flavour
唔係嘅話 你應該做唔到呢題

b part
2條友 買同一樣2個嘅flavour
by independence,
P(C_1=(C,V) and C_2=(C,V)) = P(C,V)*P(C,V)

答案應該係3個case 2次方加埋
(P(C,V))^2+(P(C,S))^2+(P(V,S))^2

純粹提供意見 錯咗我不負責
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