设函数z=ln(x y ((x y)² 1)½,则z对x求偏到为多少?

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偏导数设二次函数Z=X^xy,求∂z/∂x,∂z/∂y.

第一个:z=x^xy=e^[ln(x^xy)]=e^(xylnx)令u=xy*lnx,则z=e^u∂z/∂x=(x^u)'•u'=(e^u)•(xyln

设函数f与g均可微,z=f(xy,lnx+g(xy)),则x*z关于x的微分-y*z关于y的微分=

设u=xy,v=lnx+g(xy),则x(∂z/∂x)-y(∂z/∂y)=∂f/∂v.原因如下:dz=(∂f/

设函数Z=Z(X,Y) 由方程XY=e^z-z所确定的隐函数,求a^2z/axay

e^y-e^x=xy两边求导,得e^y*y'-e^x=y+xy'(e^y-x)y'=(e^x+y)所以y'=(e^x+y)/(e^y-x)x=0时,e^y-e^0=0,则e^y=1,则y=0所以y'(

设方程xz+yz+xy=e的定函数z=z(x,y),求dz

两边同时微分zdx+xdz+zdy+ydz+xdy+ydx=0(x+y)dz+(y+z)dx+(z+x)dy=0dz=-[(y+z)dx+(z+x)dy]/(x+y)

设y=ln(xy)求偏导数∂z/∂x

z'x=(-y/x^2)/(y/x)=-1/xz'y=(1/x)/(y/x)=1/ydz=z'xdx+z'ydyu=ln(x^2+y^2+z^2)u'x=2x/(x^2+y^2+z^2)u'y=2y/

设z=f(x,y)是由方程e^z-Z+xy^3=0确定的隐函数

e^z-z+xy^3=0偏z/偏x:z'e^z-z'+y^3=0y^3=z'(1-e^z)z'=y^3/(1-e^z)偏z/偏y:z'e^z-z'+3xy^2=0z'=3xy^2/(1-e^z)偏z/

z= xy ln(xy) 求全微分dz

dz=d(xyln(xy))=xyd(ln(xy))+ln(xy)d(xy)=xyd(xy)/(xy)+ln(xy)d(xy)=d(xy)+ln(xy)d(xy)=(1+ln(xy))d(xy)=(1

设函数y=f(x)由方程 ln(x+y)=xy^2+sinx确定,则dy/dx|x=0=?怎么算呢

把x=0代入方程,求得y=1,再利用隐函数求导法则,两边对x求导(可把y换成f(x),以免犯错)即有,左边为(1+y')/(x+y)右边为y^2+2xyy'+cosx将x=0,y=1代入从而(1+y'

设函数z=z(x,y)由方程e^(-xy)-2z+e^z=0确定,求z/x,z/y

两端对x求偏导得:-ye^(-xy)-2(z/x)+(z/x)e^z=0,所以,z/x=ye^(-xy)/(e^z-2)两端对y求偏导得:-xe^(-xy)-2(z/y)+(z/y)e^z=0,所以,

简单的复变函数题设f(z)={ xy/(x*x+y*y),z不等于0:0,z等于0;证明;f(z)在z=0处不连续.

当点(x,y)沿x轴和y轴趋于(0,0)时,f(z)的极限都是0.但它沿直线y=mx趋于(0,0)时,limf(x,y)=lim(mx*x/(x*x+m*m*x*x))=m/(1+m*m),对于不同的

设方程xy+e^x ln y=1确定了函数y(x),则y'(0)=

将x=0代入方程得:lny=1,得y=e方程两边对x求导:y+xy'+e^xlny+y'e^x/y=0代入x=0,y=e得:e+lne+y'/e=0,得y'=-e(e+1)即y'(0)=-e(e+1)

u=ln(xy+z)求du=

u=ln(xy+z)du=d[ln(xy+z)]/dx*dx+d[ln(xy+z)]/dy*dy+d[ln(xy+z)]/dz*dz=y/(xy+z)*dx+x/(xy+z)*dy+1/(xy+z)*

6、设z=(x^2)*ln(2xy),求z对x的一阶,二阶偏导数,和z对y的一阶,二阶偏导数

z=(x^2)*ln(2xy),Zx=(2x)ln(2xy)+(x^2)/2xy*(2xy)'=(2x)ln(2xy)+xZxx=2ln(2xy)+(2x)/2xy*(2xy)'+1=2ln(2xy)

设函数z=f(xy,e^x+y),其中f.,求一阶偏导数?

令u=xy,v=e^(x+y)Z'x=Z'u*U'x+Z'v*V'x=f'u*y+f'v*e^(x+y)Z'y=Z'u*U'y+Z'v*V'y=f'u*x+f'v*e^(x+y)

设函数z=xy-y/x,求全微分dz=

dz=(y+y/(X^2))dx+(x-1/x)dy,

设函数z=xyln(xy),求全微分dz

dz=[yIn(xy)+y]dx+[xIn(xy)+x]dy分开求导

设z=uv,u=e^(x+y),v=ln(xy)求dy

dy/dx=dy/du*du/dx+dy/dv*dv/dx=v*e^(x+y)+u*y/x=ln(xy)*e^(x+y)+e^(x+y)*y/x=e^(x+y)[ln(xy)+y/x]所以dy=e^(

设z=ln(eu+v),v=xy,u=x2-y2,求dz/dx,dz/dy.

说明:eu应该是e的x次幂,dz/dx,dz/dy应该是偏导数.∵v=xy,u=x2-y2∴du/dx=2x,du/dy=-2y,dv/dx=y,dv/dy=x∵z=ln(e^u+v),∴dz/dx=