| 1 | ÷ | 2 | × | ( | 13 | − | 2 | x | ) | ( | 11 | − | x | ) | = | 8 |
| 方程左边 = | 1 2 | ( | 13 | − | 2 | x | ) | ( | 11 | − | x | ) |
1 2 | ( | 13 | − | 2 | x | ) | ( | 11 | − | x | ) | = | 8 |
| 方程左边 = | 1 2 | × | 13 | ( | 11 | − | x | ) | − | 1 2 | × | 2 | x | ( | 11 | − | x | ) |
| = | 13 2 | ( | 11 | − | x | ) | − | 1 | x | ( | 11 | − | x | ) |
| = | 13 2 | × | 11 | − | 13 2 | x | − | 1 | x | ( | 11 | − | x | ) |
| = | 143 2 | − | 13 2 | x | − | 1 | x | ( | 11 | − | x | ) |
| = | 143 2 | − | 13 2 | x | − | 1 | x | × | 11 | + | 1 | x | x |
| = | 143 2 | − | 13 2 | x | − | 11 | x | + | 1 | x | x |
| = | 143 2 | − | 35 2 | x | + | 1 | x | x |
143 2 | − | 35 2 | x | + | 1 | x | x | = | 8 |