(x²+y²-z²+2xy)/(x²-y²+z²-2xz)计
(x²+y²-z²+2xy)/(x²-y²+z²-2xz)计
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
已知x/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
正整数x、y、z满足x&3-y&3-z&3=3xyz,x²=0(y+z),则xy+yz+xz=()
已知x-y=1/2+√3,y-z=1/2-√3,求x²+y²+z²-xy-xz-yz的值
已知x-y=-1,z-y=2,求x²+y²+z²-xy-yz-xz的值
已知x+y+z=10,xy+xz+yz=8,求x²+y²+z²的值
已知x:y:z=1:2:3,xy+yz+xz=66,求2x²+12y²-9z²的值.
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值