| 5 | + | ( | x | + | 1 | ) | ( | x | + | 2 | ) | ( | x | + | 3 | ) | = | 0 |
| 方程左边 = | 5 | + | x | ( | x | + | 2 | ) | ( | x | + | 3 | ) | + | 1 | ( | x | + | 2 | ) | ( | x | + | 3 | ) |
| = | 5 | + | x | x | ( | x | + | 3 | ) | + | x | × | 2 | ( | x | + | 3 | ) | + | 1 | ( | x | + | 2 | ) | ( | x | + | 3 | ) |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | ( | x | + | 3 | ) | + | 1 | ( | x | + | 2 | ) |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | x | × | 2 |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | x | × | 6 |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 6 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 6 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 6 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 6 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 9 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 9 | x |
| = | 5 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 9 | x |
| = | 11 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 11 | x |
| 11 | + | x | x | x | + | x | x | × | 3 | + | x | × | 2 | x | + | 11 | x | = | 0 |