| ( | X | − | 1 | ) | ( | X | − | 2 | ) | ( | X | − | 3 | ) | ( | X | − | 4 | ) | = | 0 |
| 方程左边 = | X | ( | X | − | 2 | ) | ( | X | − | 3 | ) | ( | X | − | 4 | ) | − | 1 | ( | X | − | 2 | ) | ( | X | − | 3 | ) | ( | X | − | 4 | ) |
| = | X | X | ( | X | − | 3 | ) | ( | X | − | 4 | ) | − | X | × | 2 | ( | X | − | 3 | ) | ( | X | − | 4 | ) | − | 1 | ( | X | − | 2 | ) | ( | X | − | 3 | ) | ( | X | − | 4 | ) |
| = | X | X | X | ( | X | − | 4 | ) | − | X | X | × | 3 | ( | X | − | 4 | ) | − | X | × | 2 | ( | X | − | 3 | ) | ( | X | − | 4 | ) |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | ( | X | − | 4 | ) |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |
| = | X | X | X | X | − | X | X | X | × | 4 | − | X | X | × | 3 | X |