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作者 walkwall 在 PTT [ Math ] 看板的留言(推文), 共500則

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[代數] 解未知數

[ Math ]4 留言, 推噓總分: +3

作者: xy210742 - 發表於 2023/04/13 21:06(1年前)

1^F推walkwall: 作業要自己寫喔...伸手牌也至少先問過 ChatGPT 吧04/14 06:27

2^F推walkwall: 看了你往年的問題似乎都可以找ChatGPT 時代變了04/14 06:42

3^F→walkwall: 試試看新東西吧不要再把這邊當答案產生器了04/14 06:42

求救一題級數收斂的證明

[ Math ]9 留言, 推噓總分: +4

作者: Ruby121314 - 發表於 2022/12/25 00:31(1年前)

2^F推walkwall: 或者就每兩項併一起看就好了12/25 08:20

4^F推walkwall: 喔我的意思是併成 1/(4k+1)-1/(4k-1) 的級數12/25 09:13

5^F→walkwall: 其中n=2k-1 與 n=2k 這樣併完只有一項12/25 09:14

[中學] 遞迴式求極限

[ Math ]11 留言, 推噓總分: +5

作者: wu1212121212 - 發表於 2022/12/20 20:42(1年前)

2^F推walkwall: 化成 b_n-2n/(n-1)=(n+1)/2n*(b_(n-1)-2n/(n-1))12/20 22:29

3^F→walkwall: 不知道會不會有幫助12/20 22:29

[中學] 矩形切割問題

[ Math ]34 留言, 推噓總分: +8

作者: tan7312 - 發表於 2022/12/15 13:03(1年前)

27^F推walkwall: 推樓上12/16 15:22

[微積] Lagrange Multiplier應用2

[ Math ]7 留言, 推噓總分: +5

作者: shunit - 發表於 2022/12/12 15:27(1年前)

1^F推walkwall: 一定要用這算法嗎不能把h替換成50/3x^2?12/12 19:25

3^F推walkwall: 意思是高度不需要另外設變數h 用x表達就好不是嗎12/13 09:36

4^F→walkwall: 寬x 長3x 高50/3x^2 則價錢為3000x^2+800000x^-112/13 09:38

5^F→walkwall: 打錯價錢是60000x^2+800000x^-1 這樣再算不就好?12/13 09:39

6^F推walkwall: 然後在微分等於零處有極值單變量直接算即可12/13 09:48

[中學] 高中向量線性組合問題

[ Math ]2 留言, 推噓總分: +1

作者: deardidi - 發表於 2022/12/09 16:17(1年前)

1^F推walkwall: P用參數式代入後把x,y分別以三角函數表達再把x+12/09 16:55

2^F→walkwall: y的三角函數化簡成只有sin or cos 應該是這個思路12/09 16:56

排列組合問題

[ Math ]10 留言, 推噓總分: +3

作者: boska201 - 發表於 2022/12/02 11:43(1年前)

4^F推walkwall: 不就二項式定理 / 楊輝三角形第八層嗎12/02 12:26

5^F→walkwall: 楊輝三角形wiki第一張圖最下一層就是12/02 12:27

6^F→walkwall: 1 8 28 56 70 56 28 8 112/02 12:28

[代數] 求數列和

[ Math ]5 留言, 推噓總分: +2

作者: Swartz - 發表於 2022/12/01 19:27(1年前)

5^F推walkwall: XDD12/02 02:09

[其他] 念工程數學的基礎是什麼

[ Math ]31 留言, 推噓總分: +8

作者: PCMAN2005 - 發表於 2022/11/24 14:46(1年前)

31^F推walkwall: XDDD11/26 10:52

[微積] 關於Lagrange multiplier的課文內容

[ Math ]18 留言, 推噓總分: +5

作者: attack2000 - 發表於 2022/11/19 23:32(1年前)

8^F推walkwall: 如果說是想聽白話解釋你可以這樣想: 你在一塊地區11/20 04:11

9^F→walkwall: 內想找到海拔(f函數)最高的點x_i不容易但如果你是11/20 04:13

10^F→walkwall: 只想在一個限制區域內(條件g)找到區域內最高點就相11/20 04:14

11^F→walkwall: 對容易得多因為你是在找高點的過程所以先假定你11/20 04:17

12^F→walkwall: 區域內還沒有高點也就是極值發生在邊界上11/20 04:18

13^F→walkwall: 這個g你就想成是一個木樁釘在原地然後從木樁拉條11/20 04:19

14^F→walkwall: 長度為C的繩子在繩子範圍內找最高點11/20 04:19

15^F→walkwall: 那麼繩子區域邊界的最高處區域邊界線會與等高線相11/20 04:22

16^F→walkwall: 切11/20 04:22

17^F推walkwall: 我講得也沒很清楚XD 總之可以先從中文維基下手11/20 04:29

18^F→walkwall: 詞條:拉格朗日乘數我講的是圖1的那個意思11/20 04:30

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