1 2 | ( | 3 | t | − | 10 | ) | ( | 16 | − | 2 | t | ) | = | 20 |
| 方程左边 = | 1 2 | × | 3 | t | ( | 16 | − | 2 | t | ) | − | 1 2 | × | 10 | ( | 16 | − | 2 | t | ) |
| = | 3 2 | t | ( | 16 | − | 2 | t | ) | − | 5 | ( | 16 | − | 2 | t | ) |
| = | 3 2 | t | × | 16 | − | 3 2 | t | × | 2 | t | − | 5 | ( | 16 | − | 2 | t | ) |
| = | 24 | t | − | 3 | t | t | − | 5 | ( | 16 | − | 2 | t | ) |
| = | 24 | t | − | 3 | t | t | − | 5 | × | 16 | + | 5 | × | 2 | t |
| = | 24 | t | − | 3 | t | t | − | 80 | + | 10 | t |
| = | 34 | t | − | 3 | t | t | − | 80 |
| 34 | t | − | 3 | t | t | − | 80 | = | 20 |