| 8 | ( | a | − | 1 | ) | + | 4 | ( | a | − | 2 | ) | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) | = | 144 |
| 方程左边 = | 8 | a | − | 8 | × | 1 | + | 4 | ( | a | − | 2 | ) | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) |
| = | 8 | a | − | 8 | + | 4 | ( | a | − | 2 | ) | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) |
| = | 8 | a | − | 8 | + | 4 | a | − | 4 | × | 2 | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) |
| = | 8 | a | − | 8 | + | 4 | a | − | 8 | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) |
| = | 12 | a | − | 16 | − | 6 | ( | a | − | 2 | ) | ( | a | − | 2 | ) |
| = | 12 | a | − | 16 | − | 6 | a | ( | a | − | 2 | ) | + | 6 | × | 2 | ( | a | − | 2 | ) |
| = | 12 | a | − | 16 | − | 6 | a | ( | a | − | 2 | ) | + | 12 | ( | a | − | 2 | ) |
| = | 12 | a | − | 16 | − | 6 | a | a | + | 6 | a | × | 2 | + | 12 | ( | a | − | 2 | ) |
| = | 12 | a | − | 16 | − | 6 | a | a | + | 12 | a | + | 12 | ( | a | − | 2 | ) |
| = | 24 | a | − | 16 | − | 6 | a | a | + | 12 | ( | a | − | 2 | ) |
| = | 24 | a | − | 16 | − | 6 | a | a | + | 12 | a | − | 12 | × | 2 |
| = | 24 | a | − | 16 | − | 6 | a | a | + | 12 | a | − | 24 |
| = | 36 | a | − | 40 | − | 6 | a | a |
| 36 | a | − | 40 | − | 6 | a | a | = | 144 |