| 1 -3 5| | 1 -3 5 | | 1 -3 5 |
| 1 -2 0| = | 0 1 -5 | = | 0 1 -5 |
| 1 -2 0| = | 0 1 -5 | | 0 0 7 |
所以维数为3
| 1 0 -3| | 0 3 -8|
| 1 -3 5| | 1 -3 5 | | 1 -3 5 |
| 1 -2 0| = | 0 1 -5 | = | 0 1 -5 |
| 1 -2 0| = | 0 1 -5 | | 0 0 7 |
所以维数为3
| 1 0 -3| | 0 3 -8|