3z-y=2z=-11 这儿不对吧x+y-z=-3①2x+y-3z=-2②3x-y+2z=-11 ③①-②x+y-z-2x-y+3z=-3+2-x+2z=-1④①+③x+y-z+3x-y+2z=-3-114x+z=-14⑤④*4+⑤-4x+8z+4x+z=-4-149z=-18z=-2将z=-2代入⑤4x-2=-144x=-12x=-3将x=-3代入①-3+y+2=-3y=-2
