x-3=y-2=z-1,求x^2+y^2+z^2-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=1,xy+yz+xz=0,求x^2+y^2+z^2的值.
已知1=xy/x+y,2=yz/y+z,3=xz/x+z,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
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
如果1=xy/x+y,2=yz/y+z,3=xz/x+z,则x的值?
若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值.
若x/3=y=z/4,且xy+xz+yz=76,求2x*x+12y*y+9z*z的值
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
已知x-y=1/2+√3,y-z=1/2-√3,求x²+y²+z²-xy-xz-yz的值
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
已知x:y:z=1:2:3,且xy+yz+xz=66,求2x^2+12y^2-9z^2的值