1 2 2 1 2

- 1 - 1 0 - 1 1

1 3 5 0 4

r2+r 1，r3-r 1

1 2 2 1 2

0 1 2 0 3

0 1 3 - 1 2

r 1-2r2，r3-r2

1 0 -2 1 -4

0 1 2 0 3

0 0 1 - 1 - 1

r 1+2r3，r2-2r3

1 0 0 - 1 -6

0 1 0 2 5

0 0 1 - 1 - 1

X =

- 1 -6

2 5

- 1 - 1

Satisfied, please adopt.