2xz-2xyz+ln(xyz)=0
全微分！
[2z-2yz+yz/(xyz)]dx+[-2xz+xz/(xyz)]dy+[2x-2xy+xy/(xyz)]dz=0
x=1,y=1时，z=1
则: [2-2+1]dx+[-2+1]dy+[2-2+1]dz=0
dz=-dx+dy
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
∂z/∂x=(2uux'+vx')/(u^2+v)=(2u*ycosx+2x)/(u^2+v)
∂z/∂y=(2uuy'+vy')/(u^2+v)=(2u*sinx+1)/(u^2+v)
全微分！
[2z-2yz+yz/(xyz)]dx+[-2xz+xz/(xyz)]dy+[2x-2xy+xy/(xyz)]dz=0
x=1,y=1时，z=1
则: [2-2+1]dx+[-2+1]dy+[2-2+1]dz=0
dz=-dx+dy
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
∂z/∂x=(2uux'+vx')/(u^2+v)=(2u*ycosx+2x)/(u^2+v)
∂z/∂y=(2uuy'+vy')/(u^2+v)=(2u*sinx+1)/(u^2+v)
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