x^2-2xy-z^2+y^2分之x^2+2yz-y^2-z^2 约分

代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy X-5分之1X=Z,Y-2分之1Y=Z,2Z+9=XY 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 x+y分之xy=5,y+z分之yz=2分之7,z+x分之zx=4,则xy+yz+zx分之xyz=? 已知x+y分之xy=1,y+z分之yz=2,z+x分之zx=3,求x+y+z的值 已知xy分之x+y=3,yz分之y+z=2,xz分之x+z=1,求x,y,z的值 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] (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 上题就算了 x^2-(y-z)^2分之x^2-y^2除以（x-y）^2-z^2分之x^2+2xy+y^2乘以x^2-xy分之x^2+xy-xz ｛x²－(y-z)²分之x²-y²｝÷｛（x-y)²-z²分之x²+2xy+y²｝×｛x²-xy分之x²+xy-xz｝ (xy-1)^2+(x+y-z)(x+y-zxy)因式分解 (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) 已知三个数x,y,z满足【x+y】分之xy=-2,【y+z】分之yz=3分之4,【z+x】分之zx=-3分之4,【xy+yz+zx】分之xyz=? 已知三个数x,y,z满足x+y分之xy=负2,y+z分之yz=3分之4,z+x分之zx=负3分之4,求xy+yz+zx分之xyz的值 x^2-2xy-z^2+y^2分之x^2+2yz-y^2-z^2 约分 化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz-yz+xy) (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) 24xy^2z^2(x+y+z)-32xyz(z-x-y)^2+8xyz^3(z-x-y)