设 =(u)^2ln v =dfrac (v)(x) , =(e)^(x^3y), 则 =-|||-A. (y)^3dx+3x(y)^2dy B. ^3dx-3xdy-|||-C. ^3dx+3x(y)^2dy D. (y)^3dx+3(x)^2(y)^2dy