[理工] [工數]-ode ode ^^"抱歉求問
y'-2xy=x^2+y^2
sol:
dy/dx = (x+y)^2
另u=x+y du=dx+dy帶入..........
我只想知道要怎麼看出來..
要用u 假設下去做~~是不是有什麼方法?
有什麼特徵嗎??
我不太會看~
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