dy=ef/ex*dx+ef/et*dt
dt=et/ex*dx+et/ey*dy
et/ex= - (eG/ex)/(eG/et)
et/ey= - (eG/ey)/(eG/et)
综合上面各式,可得:
dy/dx=[(ef/ex)-(ef/et)*(eG/ex)/(eG/et)] / [1+(ef/et)*(eG/ey)/(eG/et)]
dy=ef/ex*dx+ef/et*dt
dt=et/ex*dx+et/ey*dy
et/ex= - (eG/ex)/(eG/et)
et/ey= - (eG/ey)/(eG/et)
综合上面各式,可得:
dy/dx=[(ef/ex)-(ef/et)*(eG/ex)/(eG/et)] / [1+(ef/et)*(eG/ey)/(eG/et)]