设z=a^(xy),a>1,则dz=?
设函数z=xyln(xy),求全微分dz
设Z=x²+2xy,求dz
设Z=f(x^2 +y,2xy),求dz/dx和dz/dy
高数题,设z=x^2+xy+y^2,则dz=
设函数Z=2xy,则全微分dz=
设z=z(x,y)由方程xy+yz-e^xz=0确定,则dz=
设z=z(x,y)是由方程e^(-xy)+2z-e^z=2确定 求dz|(x=2,y=-1/2)
设z=u^2cosv^2,u=x+y,v=xy,求dz/dx,dz/dy.
设z=ln(eu+v),v=xy,u=x2-y2,求dz/dx,dz/dy.
z=x*arctan(xy),求(dz/dx)|(1,1),(dz/dy)|(1,1)
设z=exy,则dz=______.
设z=ln(x+y),则dz=