求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)

求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ) (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 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) xz+xy^2=e^z 求&z/&x ,&z/&y 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 分式题:xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz) 已知x＜0＜z,xy＞0,且|y|＞|z|＞|x|,求y/|xy|+1/|x|-2xz/|xz|的值 x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz 已知xy(x+y)^-1=1,yz(y+z)^-1=2,xz(z+x)^-1=3,试求xyz(xy+yz+xz)^-1的值 已知xy(x+y)^-1=1,yz(y+z)^-1=2,xz(z+x)^-1=3,试求xyz(xy+yz+xz)^-1的值 已知xy(x+y)^-1=1,yz(y+z)^-1=2,xz(z+x)^-1=3 求zyx(zy+xz+xy)^-1=? xy/x+y=1,xz/x+z=2,yz/y+z=3,求x的值 已知1=xy/x+y,2=yz/y+z,3=xz/x+z,求 X的值 若x-3=y-2=z-1,求x^+y^+z^-xy-yz-xz的值,若x-3=y-2=z-1,求x^+y^+z^-xy-yz-xz的值 x-3=y-2=z-1,求x^2+y^2+z^2-xy-yz-xz的值 已知x+y+z=2,xy+yz+xz=-5,求x^2+y^2+z^2的值 x+y+z=2,xy+yz+xz=1.求x^2y^2z^2 已知x+y+z=2,xy+yz+xz=-5,求x^2+y^2+z^2的值