| ( | ( | 5 | − | x | ) | ÷ | 10 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | = | ( | x | ÷ | 5 | ) | ( | x | ÷ | 5 | ) | ( | x | ÷ | 5 | ) | ( | x | ÷ | 5 | ) |
| 方程左边 = | ( | 5 | − | x | ) | ÷ | 10 | × | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 5 | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | ( | 5 | − | x | ) | ÷ | 5 | × | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 10 | ( | 5 | − | x | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 10 | × | 5 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | ( | 5 | − | x | ) | ÷ | 5 | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 10 | ( | 5 | − | x | ) | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 10 | × | 5 | − | 1 10 | x | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 10 | x | − | 1 10 | x | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 10 | x | − | 1 10 | x | ( | 5 | − | x | ) | ÷ | 5 | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 10 | x | − | 1 50 | x | ( | 5 | − | x | ) | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 10 | x | − | 1 50 | x | × | 5 | + | 1 50 | x | x | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 10 | x | − | 1 10 | x | + | 1 50 | x | x | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 10 | ( | 5 | − | x | ) | ÷ | 5 | × | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 50 | ( | 5 | − | x | ) | ( | ( | 5 | − | x | ) | ÷ | 5 | ) |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 50 | × | 5 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | + | x | × | 1 50 |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 10 | ( | ( | 5 | − | x | ) | ÷ | 5 | ) | + | x | × | 1 50 | x |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 10 | ( | 5 | − | x | ) | ÷ | 5 | + | x | × | 1 50 |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 50 | ( | 5 | − | x | ) | + | x | × | 1 50 | x |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 50 | × | 5 | + | x | × | 1 50 | x |
| = | 1 2 | − | 1 5 | x | + | 1 50 | x | x | − | x | × | 1 10 | + | x | × | 1 50 | x | + | x |
| = | 1 2 | − | 3 10 | x | + | 1 50 | x | x | + | x | × | 1 50 | x | + | x | × | 1 50 | x |
| x1= | 5 2 |