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[ Grad-ProbAsk ]21 留言, 推噓總分: +3

作者: ntust661 - 發表於 2009/11/06 19:48(14年前)

2^F→ntust661:嗯嗯直線的參數式11/06 19:53

3^F→ntust661:就很像你已知兩點，求直線的方程式11/06 19:54

4^F→ntust661:然而你在算的時後，並不是以 x 為底了11/06 19:54

5^F→ntust661:所以我另一個參數 t 來表示整個直線的樣子11/06 19:55

6^F→ntust661: x 的變化率 = (Δx )11/06 19:55

7^F→ntust661: y 的變化率 = (Δy )11/06 19:55

8^F→ntust661: z 的變化率 = (Δz )11/06 19:56

9^F→ntust661: x = x0 + Δx * t11/06 19:57

10^F→ntust661: y = y0 + Δy * t11/06 19:57

11^F→ntust661: z = z0 + Δz * t11/06 19:57

12^F→ntust661:就是參數了11/06 19:57

14^F→ntust661:會很困擾嗎@@?11/06 20:18

15^F→ntust661:一開始你會不習慣參數的積分11/06 20:19

16^F→ntust661:其實也可以直接 x y 積分11/06 20:19

17^F→ntust661:只是難XD 又不一定找的到確切的關係式11/06 20:19

19^F→ntust661:恩好你初始值是不是 t = 011/06 20:51

20^F→ntust661:然後你看一下我是不是t = 1 的時候會變成末點11/06 20:52

21^F→ntust661:反正只要記得你是取1個單位 t 來求變化量的11/06 20:52

[理工] [工數]-線積分

[ Grad-ProbAsk ]4 留言, 推噓總分: +1

作者: smallprawn - 發表於 2009/11/06 17:28(14年前)

2^F推ntust661:這很簡單@@11/06 17:48

3^F→ntust661:把 dr 改成 /v/dt11/06 17:48

[理工] [微方]-ODE

[ Grad-ProbAsk ]2 留言, 推噓總分: 0

作者: AWGN - 發表於 2009/11/06 17:27(14年前)

2^F→ntust661:有平方的才是 Ricatti11/06 19:58

[理工] [電磁]-關於馬克斯方程的微分形式

[ Grad-ProbAsk ]13 留言, 推噓總分: +6

作者: david7548 - 發表於 2009/11/06 15:32(14年前)

13^F推ntust661:推一樓的符號觀念11/06 21:23

[理工] [化熱]-溶液熱力學

[ Grad-ProbAsk ]1 留言, 推噓總分: 0

作者: kk0622 - 發表於 2009/11/06 02:25(14年前)

1^F→ntust661:改一下標題唷~~~11/06 02:33

[理工] [微積分]-對數積分

[ Grad-ProbAsk ]2 留言, 推噓總分: +1

作者: smallprawn - 發表於 2009/11/05 15:53(14年前)

1^F推ntust661:最後一串不知道再分子還是分母11/06 12:16

Re: [理工] [工數]-ODE

[ Grad-ProbAsk ]3 留言, 推噓總分: +1

作者: doom8199 - 發表於 2009/11/05 04:53(14年前)

3^F→ntust661:推11/05 15:15

[理工] [工數]-ODE

[ Grad-ProbAsk ]2 留言, 推噓總分: +1

作者: jay0748 - 發表於 2009/11/05 02:41(14年前)

1^F推ntust661:題目有錯嗎??11/05 02:57

[理工] [工數]-高階線性ODE

[ Grad-ProbAsk ]20 留言, 推噓總分: +10

作者: wade0222 - 發表於 2009/11/05 00:17(14年前)

1^F推ntust661:因為重根11/05 00:22

3^F推ntust661:重根的話 c1 y1 + c2 x y111/05 00:26

6^F推ntust661:特徵植 -1 -1 -1 411/05 00:38

8^F→ntust661:齊姓解 yh = c1e^(-x) + c2xe^(-x) +c3x^2e^(-x)+ c4e^4x11/05 00:39

Re: [理工] [工數]-ODE

[ Grad-ProbAsk ]8 留言, 推噓總分: +3

作者: ntust661 - 發表於 2009/11/04 22:15(14年前)

1^F→ntust661:分母兩倍 -4u + 10 跟樓上可以改11/04 22:16

2^F→ntust661:忘了常數@@11/04 22:22

5^F→ntust661:你怎知= =11/04 22:24

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