x+y-z=6(1) ,x-3y+2z=1(2) ,3x+2y-z=4(3) (1)*2+(2)=3x-y=13(4) (3)*2+(2)=7x+y=9(5) (4)+(5)=10x=22 x=2.2 x=2.2带入(1) y-z=3.8(6) 带入(2) -3y+2z=-1.2(7) 2(6)+(7)=-y=6.4 y=-6.4 z=-10.2