设z=㏑√(x²+y²)求（dz/dx）²+(dy/dx)²

设z=㏑√(x²+y²)求（dz/dx）²+(dy/dx)² 设Z=f(x^2 +y,2xy),求dz/dx和dz/dy 若z=e^（x^2+y^3）,求dz/dx,dz/dy 设二元函数 z=u^2,u=x+y v=x-y ,求dz/dx,dz/dy f(x,y,z)=0,z=g(x,y),求dy/dx,dz/dx 设z=u^2cosv^2,u=x+y,v=xy,求dz/dx,dz/dy. 设有方程x+y^2+z^2=2z,求dz/dx dz/dy 求函数：z^x=y^z的,dz/dx,dz/dy, 求三次积分∫(0,2)dx∫(0,√2x-x²)dy∫(0,a)z√x²+y²dz z=(2y+7)^2 * ln(x^3+2) 求dz/dx 和 dz/dy 设由方程x-z-yf(z)=0所确定的隐函数g(x,y),其中f可导,求dz/dx dz/dy 设函数z=f(x,y)由方程e^z=xyz+cos(xy)求dz/dx ,dz/dy.求详解