1.对x=ln(x+y）求微分,得dx=(dx+dy)/(x+y),∴dy=(x+y-1)dx,∴dy/dx=x+y-1.2.e^(xy)+y^3-5x=0,①求微分得e^(xy)*(ydx+xdy)+3y^2*dy-5dx=0,∴[xe^(xy)+3y^2]dy=[5-ye^(xy)]dx,∴dy/dx=[5-ye^(xy)]/[xe^(xy)+3y^2].由①...