已知x-y=(1+√3)/2,z-y=(1-√3)/2,求x²+y²+z²-xy-yz-x
已知x-y=(1+√3)/2,z-y=(1-√3)/2,求x²+y²+z²-xy-yz-x
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=2分之1+根号3,z-y=2分之1-根号3,求x²+y²+z²-xy-yz-x
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
已知x+y+z=1,x²+y²+z²=2求xy+yz+zx
已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值
已知4x-3y-3z=0,x-3y-z=0 求xy+2yz/x²+y²+z²
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
已知3x-4y-z=0 2x+y-8z =0,求(x²+y²-z²)/(xy+yz)的值
已知xy:yz:zx=3:2:1,求①x:y:z ②x/yz:y/zx
已知x:y:z=1:2:3,xy+yz+xz=66,求2x²+12y²-9z²的值.
已知x-3=y-2=z-1,试求x²+y²+z²-xy-yz-zx的值