x+2y=2 (1)
2y+3z=4 (2)
x+3z=6(3)
(1)+(2)+(3)
2x+4y+6z=12
x+2y+3z=6(4)
(4)-(1)
得3z=4
z=4/3
(4)-(2)
得x=2
(4)-(3)
得2y=0
y=0
所以｛x=2｛y=0 {z=4/3