若4x-3y-6z=0,x+2y-7z=0,则x-y-z=?

若4x-3y-6z=0,x+2y-7z=0,则x-y-z=?
若4x-3y-6z=0,x+2y-7z=0,则x-y-z=?

若4x-3y-6z=0,x+2y-7z=0,则x-y-z=?
4x-3y-6z=0,
x+2y-7z=0→x=7z-2y,
4(7z-2y)-3y-6z=0→22z-11y=0→2z=y,
x=7z-2y=7z-4z=3z,
x-y-z=3z-2z-z=0如果还有什么不懂的尽管问,希望有帮上你的忙.