已知(3x^2y+8xy^2)dx+(x^3+8x^2y+12ye^y)dy是xOy某一函数u(x.y)的全微分,求这个u(x.y).

已知x^2y+2xy+3=－18 求dy/dx 已知x^2y+2xy+3=－18 求dy/dx 微分方程求解 (x^2y^3+xy)dy=dx 解微分方程 (x^2y^3+xy)dy=dx x^2+xy+y^3=1,求dy/dx dy/dx=(x+y^3)/(xy^2) 微分方程求解 (x^2y^3+xy)dy=dx dy/dx=(x+y^3)/xy^2 常微分方程dy/dx=(x^3+xy^2)/y dy/dx=(xy+3x-y-3)/(xy-2x+4y-8) 微分方程怎么求呀,求教, 已知df(x,y)=(2y^2+2xy+3x^2)dx+(4xy+x^2)dy,求f(x,y)答案是2xy^2+x^2y+x^3+C 已知：yf(x)+x^2*f(y)=2xy,求dy/dx 已知(3x^2y+8xy^2)dx+(x^3+8x^2y+12ye^y)dy是xOy某一函数u(x.y)的全微分,求这个u(x.y). y/x=ln(xy) 求dy/dx(xy-y^2)/(xy+x^2) 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知x^2+y^2=r^2,求(xy^2+y^3)dy-(x^3+x^2y)dx的积分,用格林公式 已知e^y+e^x-xy^2=0,求dy/dx高等数学求导 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值