| ( | 3 20 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | = | 1 1000000000000000000 | x |
| 方程左边 = | 3 20 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) |
| = | 3 20 | × | 1 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | x | ( | 1 | − | x | ) |
| = | 3 20 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) |
| = | 3 20 | × | 1 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) |
| = | 3 20 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | ( | 1 | − | x | ) |
| = | 3 20 | × | 1 | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x |
| = | 3 20 | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) |
| = | 3 20 | × | 1 | − | 3 20 | x | − | 3 20 | x | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 |
| = | 3 20 | − | 3 20 | x | − | 3 20 | x | ( | 1 | − | x | ) | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x |
| = | 3 20 | − | 3 20 | x | − | 3 20 | x | × | 1 | + | 3 20 | x | x | − | 3 20 | x | ( | 1 | − | x | ) |
| = | 3 20 | − | 3 20 | x | − | 3 20 | x | + | 3 20 | x | x | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) |
| = | 3 20 | − | 3 10 | x | + | 3 20 | x | x | − | 3 20 | x | ( | 1 | − | x | ) | ( | 1 | − | x | ) | − | 3 20 | x |
| = | 3 20 | − | 3 10 | x | + | 3 20 | x | x | − | 3 20 | x | × | 1 | ( | 1 | − | x | ) | + | 3 20 | x |
| = | 3 20 | − | 3 10 | x | + | 3 20 | x | x | − | 3 20 | x | ( | 1 | − | x | ) | + | 3 20 | x | x |
| = | 3 20 | − | 3 10 | x | + | 3 20 | x | x | − | 3 20 | x | × | 1 | + | 3 20 | x | x |
| = | 3 20 | − | 3 10 | x | + | 3 20 | x | x | − | 3 20 | x | + | 3 20 | x | x | + | 3 20 |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| = | 3 20 | − | 9 20 | x | + | 3 20 | x | x | + | 3 20 | x | x | + | 3 20 | x | x |
| x1= | 3 20 |