[理工] [工數]-ODE

看板Grad-ProbAsk作者 (汪汪)時間14年前 (2010/04/16 21:48), 編輯推噓2(207)
留言9則, 5人參與, 最新討論串233/280 (看更多)
Let the scalar functions x (t) and x (t) 1 2 be two different solutions of the following differential equation sint x" + cost x' + t = 5 ,then is 3x (t)+7x (t) 1 2 also a solution? Please prove your answer mathematically. A simple yes or no answer is not credited. 這題要怎麼解呢 沒看過係數是三角的= = -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.165.24.50

04/16 21:51, , 1F
(sinx')' = (5-t)
04/16 21:51, 1F

04/16 21:52, , 2F
對不起= =, (sint x')' = (5-t)
04/16 21:52, 2F

04/16 21:53, , 3F
摁摁 我算算看~
04/16 21:53, 3F

04/16 22:13, , 4F
徵求高手幫解...
04/16 22:13, 4F

04/16 22:31, , 5F
這題他沒有要你解阿 他只是問3x1+7x2也是不是解而已
04/16 22:31, 5F

04/16 22:33, , 6F
摁 我知道 但是要怎麼證呢
04/16 22:33, 6F

04/17 01:23, , 7F
04/17 01:23, 7F

04/17 01:23, , 8F
因為它是非齊性ODE
04/17 01:23, 8F

04/17 01:38, , 9F
K大自從放榜就鬆了不少((溜
04/17 01:38, 9F
文章代碼(AID): #1Bo6gmiY (Grad-ProbAsk)
討論串 (同標題文章)
文章代碼(AID): #1Bo6gmiY (Grad-ProbAsk)