已知4x-3y-6z=0,x+2y-7y=0(xyz≠0),求代数式5x^2+2y^2-z^2/2x^2-3y^2-10

已知4x-3y-6z=0,x+2y-7y=0(xyz≠0),求代数式5x^2+2y^2-z^2/2x^2-3y^2-10 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2x+3y-4z=0,3x+4y+5z=0,且xyz≠0 .(1)分别用含有z的代数式表示x、y (2)求x+y+z 若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 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xyz不等于0,且2x-y+z=0,x-2y+3z=0,求代数式 已知x+y-7z=0 x-2y+5z=0(xyz不等于0）,求x+2y-z/y-2x+12z 已知有理数x.y.z满足（x-z-2)^2+(3x-6y-7)^2=/3y+3z-4/=0求xyz=多少 已知一方程组：x-3y+7z=0与x-2y+4z=0(xyz≠0）,求x:y:z. 已知有理数x,y,z满足(x-z-2)^2+(3x-6y-7)^2+|3y+3z-4|=0求xyz的值 1.已知 x-3y+7z=0,x-2y+4z=0.(xyz≠0),求 x:y:z 已知x-2y+z=0,3x+6y-z=0(xyz≠0),求2x²+y²/x²+y²