已知x+yz=x+zy=y+zx,且xyz≠0
已知x,y,z互不相等,且xyz不等于0,x2+yz=z2,y2+zx=x2,求证:z2+xy=y2
已知x+y-z=0,2x-y-8z=0,且xyz不等于0,则x2+y2+z2/(xy+yz+zx)等于
(x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2
已知2分之x=3分之y=4分之z,且xyz不等于0,求分式x2+y2+z2分之xy+yz+zx的值
分解因式:xyz-yz-zx-xy+x+y+z-1
已知x,y,z都是正数,且xyz=1,求证:xy(x+y)+yz(y+z)+zx(z+x)》6
1.已知4(xy-zx-y²+yz)=-z²+2zx-x²,求z-zy+x-3的值
已知x-4y-z=0,2x+y-8z=0,且xyz不全为0,求x:y:z的值?的值?求代数xy+yz+zx分之x
已知xyz都是实数,且x^2+y^2+z^2=1,则m=xy+yz+zx有无最大值或最小值
已知三个数x,y,z,满足xy/x+y=-2,yz/y+z=4/3,zx/z+x=-4/3,求(xyz)/(xy+yz+
急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy
已知实数xyz满足x+y+z=5,xy+yz+zx=3,求z的最大值