| ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 9 20 | x | ) | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | = | x | + | 1 |
| 方程左边 = | 1 | ( | 1 | + | 9 20 | x | ) | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 11 20 | x | ( | 1 | + | 9 20 | x | ) | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) |
| = | 1 | × | 1 | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 1 | × | 9 20 | x | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 11 20 |
| = | 1 | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 11 20 | x | ( | 1 | + | 9 20 | x | ) |
| = | 1 | × | 1 | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 1 | × | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x | ( | 1 | + | 1 2 | x | ) |
| = | 1 | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x | ( | 1 | + | 1 2 | x | ) | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) |
| = | 1 | × | 1 | ( | 1 | + | 11 20 | x | ) | + | 1 | × | 11 20 | x | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 |
| = | 1 | ( | 1 | + | 11 20 | x | ) | + | 11 20 | x | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x | ( | 1 | + | 1 2 | x | ) |
| = | 1 | × | 1 | + | 1 | × | 11 20 | x | + | 11 20 | x | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) |
| = | 1 | + | 11 20 | x | + | 11 20 | x | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x |
| = | 1 | + | 11 20 | x | + | 11 20 | x | × | 1 | + | 11 20 | x | × | 11 20 | x | + | 1 2 | x |
| = | 1 | + | 11 20 | x | + | 11 20 | x | + | 121 400 | x | x | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) |
| = | 1 | + | 11 10 | x | + | 121 400 | x | x | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | ( | 1 | + | 11 20 | x | ) | + | 9 20 | x |
| = | 1 | + | 11 10 | x | + | 121 400 | x | x | + | 1 2 | x | × | 1 | ( | 1 | + | 11 20 | x | ) | + | 1 2 | x |
| = | 1 | + | 11 10 | x | + | 121 400 | x | x | + | 1 2 | x | ( | 1 | + | 11 20 | x | ) | + | 11 40 | x | x |
| = | 1 | + | 11 10 | x | + | 121 400 | x | x | + | 1 2 | x | × | 1 | + | 1 2 | x | × | 11 20 |
| = | 1 | + | 11 10 | x | + | 121 400 | x | x | + | 1 2 | x | + | 11 40 | x | x | + | 11 40 |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| = | 1 | + | 8 5 | x | + | 121 400 | x | x | + | 11 40 | x | x | + | 11 40 | x | x |
| x1=0 |