| ( | 8 | − | 2 | t | ) | ( | 6 | − | t | ) | × | 1 2 | = | 8 |
| 方程左边 = | 8 | ( | 6 | − | t | ) | × | 1 2 | − | 2 | t | ( | 6 | − | t | ) | × | 1 2 |
| = | 4 | ( | 6 | − | t | ) | − | 1 | t | ( | 6 | − | t | ) |
| = | 4 | × | 6 | − | 4 | t | − | 1 | t | ( | 6 | − | t | ) |
| = | 24 | − | 4 | t | − | 1 | t | ( | 6 | − | t | ) |
| = | 24 | − | 4 | t | − | 1 | t | × | 6 | + | 1 | t | t |
| = | 24 | − | 4 | t | − | 6 | t | + | 1 | t | t |
| = | 24 | − | 10 | t | + | 1 | t | t |
| 24 | − | 10 | t | + | 1 | t | t | = | 8 |