分别对两式求微分
yzdx+x(ydz+zdy)=0 => xydz/dx + xzdy/dx=-yz (1)
xdy+ydx+ydz+zdy+xdz+zdx=0 => (x+z)dy/dx + (y+x)dz/dx=-y-z (2)
联立(1)(2)求dy/dx和dz/dx
分别对两式求微分
yzdx+x(ydz+zdy)=0 => xydz/dx + xzdy/dx=-yz (1)
xdy+ydx+ydz+zdy+xdz+zdx=0 => (x+z)dy/dx + (y+x)dz/dx=-y-z (2)
联立(1)(2)求dy/dx和dz/dx