| 9 | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 1 | ) | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 | = | 0 |
| 方程左边 = | 9 | × | 2 | x | ( | 2 | x | − | 1 | ) | − | 9 | × | 1 | ( | 2 | x | − | 1 | ) | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 |
| = | 18 | x | ( | 2 | x | − | 1 | ) | − | 9 | ( | 2 | x | − | 1 | ) | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 |
| = | 18 | x | × | 2 | x | − | 18 | x | × | 1 | − | 9 | ( | 2 | x | − | 1 | ) | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 |
| = | 36 | x | x | − | 18 | x | − | 9 | ( | 2 | x | − | 1 | ) | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 |
| = | 36 | x | x | − | 18 | x | − | 9 | × | 2 | x | + | 9 | × | 1 | − | 6 | ( | 2 | x | − | 1 | ) |
| = | 36 | x | x | − | 18 | x | − | 18 | x | + | 9 | − | 6 | ( | 2 | x | − | 1 | ) | + | 1 |
| = | 36 | x | x | − | 36 | x | + | 10 | − | 6 | ( | 2 | x | − | 1 | ) |
| = | 36 | x | x | − | 36 | x | + | 10 | − | 6 | × | 2 | x | + | 6 | × | 1 |
| = | 36 | x | x | − | 36 | x | + | 10 | − | 12 | x | + | 6 |
| = | 36 | x | x | − | 48 | x | + | 16 |
| 36 | x | x | − | 48 | x | + | 16 | = | 0 |
| x1= | 2 3 |
| x2= | 2 3 |