设z=arctan(xy)+2x^2+y^2,求dz

设z=arctan(xy)+2x^2+y^2,求dz 设z=arctan(xy),y=e^x ,求dz/dx ． 设函数z=(x^2+y^2)*{e^-arctan(x/y)},求dz与a^2z/axay z=arctan【(x+y)/(1-xy)】的偏导数 讨论函数z=arctan(x+y)/(1-xy)的连续性方程是z=arctan[(x+y)/(1-xy)] z=x^2*arctan(2y/x)求dz 设z=f(x^2-y^2,e^（xy)),求偏导z/x,偏导z/y 设函数z=arctan(x/y),求全微分dz 全导数:设z=arctan(xy),而y=e*x次方,求dz/dx设z=arctan(xy),而y=e*x次方,求dz/dx, z=arctan x/(1+y^2),则dz=? 求偏导数z=arctan(x—y^2) 设z=(x+2y)e^xy,求dz 设z=f(xy^2-x^2y)求z对xy的二阶偏导 设z=arctan(x+y),则σz/σy=? 急,高数,设z=x∧y-2√xy,求偏导函数z/x,z/y 设函数z=z(x,y)由方程e^(-xy)-2z+e^z=0确定,求z/x,z/y 设z=sin(xy^2)求∂^2z/∂x∂y 设z=arctan[（x+y）/（x-y）],则dz=?