Re: [理工] [工數][ode]
我這樣解是不是怪怪的阿??
xy'-4x^2y+2ylny=0
xdy-4x^2ydx+2ylnydx=0
x/ydy-4x^2dx+2lnydx=0
x dlny
- ---- + 2lnydx -4x^2dx = 0
y 1
---
y
d(lny*x^2)
----------- - 4x^2dx=0
x
x^2lny-x^4=c
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