| ( | x | − | 2 | ) | ( | x | − | 2 | ) | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) | = | - | 1 2 |
| 方程左边 = | x | ( | x | − | 2 | ) | − | 2 | ( | x | − | 2 | ) | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) |
| = | x | x | − | x | × | 2 | − | 2 | ( | x | − | 2 | ) | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) |
| = | x | x | − | 2 | x | − | 2 | x | + | 2 | × | 2 | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) |
| = | x | x | − | 2 | x | − | 2 | x | + | 4 | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) |
| = | x | x | − | 4 | x | + | 4 | − | ( | x | − | 1 | ) | ( | x | − | 1 | ) |
| = | x | x | − | 4 | x | + | 4 | − | x | ( | x | − | 1 | ) | + | 1 | ( | x | − | 1 | ) |
| = | x | x | − | 4 | x | + | 4 | − | x | x | + | x | × | 1 | + | 1 | ( | x | − | 1 | ) |
| = | x | x | − | 3 | x | + | 4 | − | x | x | + | 1 | ( | x | − | 1 | ) |
| = | x | x | − | 3 | x | + | 4 | − | x | x | + | 1 | x | − | 1 | × | 1 |
| = | x | x | − | 3 | x | + | 4 | − | x | x | + | 1 | x | − | 1 |
| = | x | x | − | 2 | x | + | 3 | − | x | x |
| x | x | − | 2 | x | + | 3 | − | x | x | = | - | 1 2 |
| x= | 7 4 |