3x-y+z=3 (1)
2x+y-3z=11, (2)
x+y+z=12. (3)
(2)+(1)得:
5x-2z=14 (4)
(2)-(3)得:
x-4z=-1 (5)
(4)X2-(5)得:
x=29/9
把x=29/9带入(4)得
z=16/9
把x=29/9,z=16/9带入(3)得
y=7
你在算(4)X2-(5)时错了!
3x-y+z=3 (1)
2x+y-3z=11, (2)
x+y+z=12. (3)
(2)+(1)得:
5x-2z=14 (4)
(2)-(3)得:
x-4z=-1 (5)
(4)X2-(5)得:
x=29/9
把x=29/9带入(4)得
z=16/9
把x=29/9,z=16/9带入(3)得
y=7
你在算(4)X2-(5)时错了!