微分方方程式を解いて下さいdx/x^2+y^2+yz=dy/x^2+y^2-zx=dz/(x+y)z

dx/x^2+y^2+yz=dy/x^2+y^2-zx=dz/(x+y)z

dx-dy/z(x+y)=dz/z(x+y)

x-y-z=c1

xdx+ydy/(x+y)(x^2+y^2)=dz/(x+y)z

xdx+ydy/x^2+y^2=dz/z

1/2log(x^2+y^2)=logz+c2

(x^2+y^2)=c2z^2

--\u0026gt;

x-y-z=c1

(x^2+y^2)=c2z^2