x^2+y^2-z^2-2xy-2z-1因式分解

化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答 化简x^2-yz/[x^2-(y+z)x+yz]+y^2-zx/[y^2-(z+x)y+zx]+z^2-xy/[z^2-(x+y)z+xy] (xy-1)^2+(x+y-z)(x+y-zxy)因式分解 设z=f(x^2-y^2,e^（xy)),求偏导z/x,偏导z/y 24xy^2z^2(x+y+z)-32xyz(z-x-y)^2+8xyz^3(z-x-y) 24xy^2z^2(x+y+z)-32xyz(z-x-y)^2+8xyz^3(z-x-y) 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) (x^2+yz)/(x^2+x(y-z)-yz)+(y^2-xz)/(y^2+y(x+z)+zx)+(z^2+yx)/(x^2-z(x-y)-yx)最后一项应为：(z^2-xy)/(z^2+z(y-x)-xy) 若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 二元函数Z=x^2-xy+4y^2,求二阶偏导数Zxx Zxy Zyy 求全微分函数Z(X,Y),已知方程 Z^2*ln（X+Z)=XY X-5分之1X=Z,Y-2分之1Y=Z,2Z+9=XY 实数x,y,z满足x=y+根号2,2xy+2*根号2*z*z+1=0,则x+y+z等于多少这是道奥赛题, (x+y-xy)/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y=1/z,则xyz=? 已知（x+y-xy）/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y-1/z,则xyz=? 设函数z=z(x,y)由方程e^(-xy)-2z+e^z=0确定,求z/x,z/y xz+xy^2=e^z 求&z/&x ,&z/&y