若x/2=y/3=z/4≠0,则(2x+3y)/z=?
若x-2y+4z=1,x+3y-7z=0,则y:z=?
若4x-3y-6z=0,x+2y-7z=0(xyz≠0),则x:y:z=______.
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
x+2y-4z=0 3x+y-z=0,则x:y:z=
x+2y-4z=0,3x+y-z=0,则x:y:z=?::
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知x+2y-4z=0,3x-y-z=0,则3x+2y+z/x+2y+z=
已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则(x+y+3z)÷(4x-y-5z)=?结果和思路!