| ( | 5 | ÷ | 6 | − | 2 | x | ÷ | 3 | ) | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) | = | 1 | ÷ | 9 |
| 方程左边 = | 5 | ÷ | 6 | × | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) | − | 2 | x | ÷ | 3 | × | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) |
| = | 5 6 | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) | − | 2 3 | x | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) |
| = | 5 6 | × | 1 | ÷ | 3 | − | 5 6 | x | ÷ | 3 | − | 2 3 | x | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) |
| = | 5 18 | − | 5 18 | x | − | 2 3 | x | ( | 1 | ÷ | 3 | − | x | ÷ | 3 | ) |
| = | 5 18 | − | 5 18 | x | − | 2 3 | x | × | 1 | ÷ | 3 | + | 2 3 | x | x | ÷ | 3 |
| = | 5 18 | − | 5 18 | x | − | 2 9 | x | + | 2 9 | x | x |
| = | 5 18 | − | 1 2 | x | + | 2 9 | x | x |
5 18 | − | 1 2 | x | + | 2 9 | x | x | = | 1 | ÷ | 9 |
| 方程右边 = | 1 9 |
5 18 | − | 1 2 | x | + | 2 9 | x | x | = | 1 9 |