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2. x²dy=(y²-xy+x²)dx
dy/dx=y²/x²-y/x+1; z=y/x => y=xz => y'=z+xz'
z+xz'=z²-z+1; xdz/dx=z²-2z+1=(z-1)²
dz/(z-1)²=dx/x; ∫dz/(z-1)²=∫dx/x; -1/(z-1)=ln|x|+C
1/(1-y/x)=ln|x|+C