x+y+z=2,xy+yz+xz=1.求x^2y^2z^2
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz
1.已知3x-4y-z=0,2x+y-8z=0.求x²+y²+z²/xy+yz+2xz 的
x-3=y-2=z-1,求x^2+y^2+z^2-xy-yz-xz的值
已知2/x=3/y=7/z,求xy+xz+yz/x^2+y^2+z^2
已知x+y+z=1,xy+yz+xz=0,求x^2+y^2+z^2的值.
已知x^2+y^2+z^2-xy-yz-xz=0,求x,y,z 的大小关系
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz
1.已知:x^2+y^2+z^2=xy+yz+xz 求证:x=y=z