→ fonlintw0621:i 大 都專解難題 10/16 00:24
→ mdpming:我只能解渣渣題 10/16 00:25
→ mdpming: 還解錯XD 10/16 00:25
→ iyenn:我專挑簡單的吃沒發現嗎XDD 10/16 00:32
推 CRAZYAWIND:我也挑簡單的吃 = = 10/16 00:33
※ 引述《pasu (心)》之銘言：
: Find solutions u(x，y) of the following equations using separating
: variables.
: u_x =yu_y
: 上面的u_x代表偏微....^^"
: 請問這題要怎麼解阿
u_x =yu_y
@u @u
---=y---
@x @y
let XY=u
X'Y=yXY'
X' Y'
---=y---=k
X Y
X'-kX=0 x=c1e^kx
yY'-kY=0 Y=c2y^k
U=Sum A(K)(y^ke^kx)=f(ye^x) f() is any function
k
--
為者常成.行者常至
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 123.193.214.165