全部加到第一行,提出一个10,然后化简
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 1 -2 -1 |
|0 -3 -2 -1 |
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 0 -4 0 |
|0 0 4 -4 |
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 0 -4 0 |
|0 0 0 -4 |
10*-4*-4=160
全部加到第一行,提出一个10,然后化简
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 1 -2 -1 |
|0 -3 -2 -1 |
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 0 -4 0 |
|0 0 4 -4 |
|1 1 1 1 |
10 |0 1 2 -1 |=
|0 0 -4 0 |
|0 0 0 -4 |
10*-4*-4=160