设z=x^y,求dz

设z=x^y,求dz 设z=ln(x^z×y^x),求dz 设z=(x+y)/(x-y),求dz 设z=(x+y)^xy,求dz 设z=(x+2y)e^xy,求dz 设函数Z=y^(2x) ,求dz . 设Z=f(x^2 +y,2xy),求dz/dx和dz/dy 设Z=f(xz,z/y)确定Z为x,y的函数求dz 设z=arctany/x,求dz? 设x+y^2+z=ln(x+y^2+z)^1/2,求dz/dx z=arctan(x/y),求dz 设二元函数 z=u^2,u=x+y v=x-y ,求dz/dx,dz/dy 设函数z=z(x,y)由方程x-y+z=e的z次确定,求dz 设z=f(x,y)由方程z+x+y=e^(z+x+y)所确定,求Dz 设z=z(x,y)由yz+x^2+z=0确定,求dz(x,y) 设z=x^2-y^2,x=sint,y=cost,求dz/dt 设函数 z=(2x+y)^x+2y 求dz 设二元函数z=sin(x-y),求αz/αy,αy/αz,dz