令p=y'=dy/dx，则y''=dp/dx=dp/dy*dy/dx=pdp/dypp'+p²/2=2y线性通解p=Ce^(-y/2)特解p=4√y-4通解dy/dx=p=Ce^(-y/2)+4√y-4再分离变量求y即可
y=x^2+2x+2令y一阶倒数为p就可以了
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