设z=(x+y)^xy,求dz

设z=(x+y)^xy,求dz 设z=(x+2y)e^xy,求dz 设Z=f(x^2 +y,2xy),求dz/dx和dz/dy 设z=x^y,求dz 微积分,设z=xy+x/y,则dz=? 设Z=(1+xy)^x,求dz| x=1 y=1 设z=ln(x^z×y^x),求dz 设z=u^2cosv^2,u=x+y,v=xy,求dz/dx,dz/dy.高数题 设z=arctan(xy),y=e^x ,求dz/dx ． 二元函数 设z=(x平方-y平方)e的xy次方,求dz 设z=f(2x+3y,e^xy),求dz 设z=arctan(xy)+2x^2+y^2,求dz 设z=f(xy,e^x+y),求dz高数计算题,坐等大侠 设z=|xy|,求dz 设z=(x+y)/(x-y),求dz 设f(x+y,x-y)=xy,z=(xy,x/y),则dz= z=f(x/y,xy),求dz z=f(xy,x^y),求dz.