2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
若x-2y+4z=1,x+3y-7z=0,则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
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
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{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?