已知x+4y-3z=0 4x-5y+2z=0(xyz≠0) 则x:(-2x):3y 为________.

已知2x-4y-5z=0,-3x+y+4z=0,（xyz≠0）则x：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4x-3y-6z=0,x+2y-7z=0(xyz不等于0)则2x方+3x方+6x方/x方+5y方+7z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. 1.已知 x-3y+7z=0,x-2y+4z=0.(xyz≠0),求 x:y:z 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z= 已知xyz满足方程组x+4y-3z=0,求x：y：z的值 4x-5y+2z=0 已知有理数x,y,z满足条件：|x-z-2|+|3x-6y-7|+（3y+3z-4）^2=0,则xyz=?