Z=（x^2+y^2）求dz

Z=（x^2+y^2）求dz 若z=e^（x^2+y^3）,求dz/dx,dz/dy同上 设有方程x+y^2+z^2=2z,求dz/dx dz/dy z=x^2*arctan(2y/x)求dz z=ln(x^2+y^2),求dz, z=3x^3y^2,求dz 设z=(x+2y)e^xy,求dz z=ln(X平方+Y平方+2),求Dz? z=(e^3y) +(x^2)Xsiny,求dz 设函数Z=y^(2x) ,求dz . z=(2y+7)^2 * ln(x^3+2) 求dz/dx 和 dz/dy 设Z=f(x^2 +y,2xy),求dz/dx和dz/dy x+y+z=0,x^2+y^2+z^2=1求dx/dz 设x+y^2+z=ln(x+y^2+z)^1/2,求dz/dx x+y^2+z=ln (x+y^2+z)^1/2 求dz/dx 设二元函数 z=u^2,u=x+y v=x-y ,求dz/dx,dz/dy z=x^2-y/x+y,而y=2x-3,求dz/dx. z=arctan(x/y),求dz