| ( | x | − | 4 | ) | ( | x | − | 3 | ) | ( | x | − | 2 | ) | = | 0 |
| 方程左边 = | x | ( | x | − | 3 | ) | ( | x | − | 2 | ) | − | 4 | ( | x | − | 3 | ) | ( | x | − | 2 | ) |
| = | x | x | ( | x | − | 2 | ) | − | x | × | 3 | ( | x | − | 2 | ) | − | 4 | ( | x | − | 3 | ) | ( | x | − | 2 | ) |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | ( | x | − | 2 | ) | − | 4 | ( | x | − | 3 | ) | ( | x | − | 2 | ) |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | x | × | 3 | × | 2 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | x | × | 6 | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 6 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 6 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 6 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 6 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 14 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 14 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 14 | x | − | 4 |
| = | x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 26 | x | − | 4 |
| x | x | x | − | x | x | × | 2 | − | x | × | 3 | x | + | 26 | x | − | 4 | = | 0 |