| a | ( | a | + | 1 | ) | ( | a | + | 2 | ) | − | 2 | ( | a | + | 1 | ) | ( | a | + | 2 | ) | ( | a | + | 3 | ) | = | 1 |
| 方程左边 = | a | a | ( | a | + | 2 | ) | + | a | × | 1 | ( | a | + | 2 | ) | − | 2 | ( | a | + | 1 | ) | ( | a | + | 2 | ) | ( | a | + | 3 | ) |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | ( | a | + | 2 | ) | − | 2 | ( | a | + | 1 | ) | ( | a | + | 2 | ) |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | a | × | 1 | × | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | a | × | 2 | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | + | 2 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 10 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 10 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 10 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 10 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 10 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 16 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 16 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 16 | a | − | 2 |
| = | a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 20 | a | − | 2 |
| a | a | a | + | a | a | × | 2 | + | a | × | 1 | a | − | 20 | a | − | 2 | = | 1 |