x+y-z=6 .(1)
x-3y+2z=1 .(2)
3x+2y-z=4.(3)
(1)+(2)+(3)得
5x=11
x=2.2
代入(1)(2)得
y-z=3.8.(4)
-3y+2z=-1.2.(5)
(4)*2+(5)得
-y=6.4
y=-6.4
代入(4)得
-6.4-z=3.8
z=-10.2
解得
x=2.2
y=-6.4
z=-10.2