[理工] [工數]-ode.................... ^^"

[topee (eason)]

      y^2      2y      3
y' = ----- +  ----- - ---
       x       x       x    y(1)=4


做不出來.....

我令(y^2+2y) = u


   dy =  xdu + udx

怪怪的  還是我令錯?

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