X+2Y+8Z=0 2X-3Y-5Z=0 XYZ≠0 x:y:z=

已知：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z) 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz 设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值 X+2Y+8Z=0 2X-3Y-5Z=0 XYZ≠0 x:y:z= 如果x+2y−8z＝02x−3y+5z＝0，其中xyz≠0，那么x：y：z=（　　） 已知x+y-7z=0 x-2y+5z=0(xyz不等于0）,求x+2y-z/y-2x+12z 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 已知2x-4y-5z=0,-3x+y+4z=0 (xyz≠0)则x/y/z=? 已知2x-4y-5z=0,-3x+y+4z=0,（xyz≠0）则x：y:z=________ (x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2