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[微分] 一個好像很簡單但我搞不懂的問題可不ꔠ…

[ trans_math ]13 留言, 推噓總分: +1

作者: lucasyao - 發表於 2010/11/10 21:45(13年前)

3^F推n19860423:兩段分別微分代1，不相等，所以不可微118.160.216.101 11/11 12:49

[微分] 求切線斜率@@

[ trans_math ]23 留言, 推噓總分: +6

作者: a039333780 - 發表於 2010/04/15 22:49(14年前)

3^F推n19860423:為何求切線斜率答案會有根號x？！114.45.137.128 04/15 23:27

8^F推n19860423:我是假設切點分別為(t,t^2+1)和(s,-s^2)114.45.137.128 04/15 23:34

9^F→n19860423:如果以微分求斜率，得2t=-2s 知t=-s114.45.137.128 04/15 23:35

10^F→n19860423:於是兩切點分別為(s,s^2+1)和(s,-s^2)114.45.137.128 04/15 23:36

11^F→n19860423: (-s,s^2+1)114.45.137.128 04/15 23:37

12^F→n19860423:則兩點連線斜率：(-2s^2-1)/2s114.45.137.128 04/15 23:37

14^F→n19860423:斜率=(-2s^2-1)/2s=2s求得s=正負根號2114.45.137.128 04/15 23:39

15^F→n19860423: 1/(根號2)114.45.137.128 04/15 23:39

17^F→n19860423:謝謝~XD114.45.137.128 04/15 23:40

23^F推n19860423:哈~不會啦~這答案錯得很明顯~沒被害到XD114.45.137.128 04/15 23:46

Re: [積分] 求救!!

[ trans_math ]2 留言, 推噓總分: +2

作者: midarmyman - 發表於 2010/04/01 21:40(14年前)

2^F推n19860423:soga~118.160.237.82 04/01 21:44

Re: [積分] 求救!!

[ trans_math ]10 留言, 推噓總分: +4

作者: n19860423 - 發表於 2010/04/01 21:24(14年前)

3^F→n19860423:哈~恭喜~但還請神人幫看又沒有出錯XD118.160.237.82 04/01 21:27

6^F→n19860423:(2x+6)*3/2=3x+9/2 所以要-5/2118.160.237.82 04/01 21:33

[張爸] 大家評評理

[ trans_math ]10 留言, 推噓總分: +3

作者: midarmyman - 發表於 2009/10/31 23:41(14年前)

8^F推n19860423:三次方吧三階導函數通常都寫f"'(x)114.45.143.126 11/01 01:23

[張爸] e^x+e^(-x)=3

[ trans_math ]4 留言, 推噓總分: 0

作者: katsuoli - 發表於 2009/07/10 13:29(15年前)

1^F→n19860423:令t=e^x 原式變成t^2-3t+1=0公式解t118.160.228.40 07/10 13:32

2^F→n19860423:兩邊同取ln是ln(e^x+e^(-x))=ln3118.160.228.40 07/10 13:33

3^F→n19860423: ^^^^^^^^^^^^^ 無法化簡118.160.228.40 07/10 13:33

Re: [請益]在數學系中政大應數比師大數學排名低嗎?

[ trans_math ]14 留言, 推噓總分: +4

作者: pobm - 發表於 2008/01/13 00:47(16年前)

4^F推n19860423:師大很多神人級的教授都退休了~有點可惜218.167.68.170 01/14 01:28

5^F→n19860423:例如林義雄、李虎雄都是很棒的老師218.167.68.170 01/14 01:29

6^F→n19860423:我都幸運的在他們退休前一學期修他的課218.167.68.170 01/14 01:29

7^F→n19860423:雖然很操，但真的學的比較紮實218.167.68.170 01/14 01:30

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