已知2x-4y-5z=0,-3x+y+4z=0 (xyz≠0) 则xy/z^2=?
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
(x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2
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=________
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+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=?
已知x+4y-3z=04x-5y+2z=0,xyz≠0,求3x2+2xy+z2x2+y2的值.
已知实数x,y,z满足:xyz不等于0,2x+3y-13z=0,x-2y+4z=0,求(x^2+y^2-z^2)/(xy
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-3z=0,x-3y-z=0(xyz≠0)则代数式xy+2yz/x的平方+y的平方-z的平方的值为?
已知方程组{2X-Y+3Z=0,X-3Y+Z=0(XYZ≠0),求3Y分之4X+2Z的值
已知一方程组:x-3y+7z=0与x-2y+4z=0(xyz≠0),求x:y:z.