| - | x | x | + | 1 | ÷ | ( | x | x | ) | + | x | − | 1 | ÷ | x | = | 4 |
| 方程两边同时乘以: | ( | x | x | ) |
| - | x | x | ( | x | x | ) | + | 1 | + | x | ( | x | x | ) | − | 1 | ÷ | 1 | × | ( | 1 | x | ) | = | 4 | ( | x | x | ) |
| - | x | x | x | x | + | 1 | + | x | ( | x | x | ) | − | 1 | ÷ | 1 | × | ( | 1 | x | ) | = | 4 | ( | x | x | ) |
| - | x | x | x | x | + | 1 | + | x | ( | x | x | ) | − | 1 | ÷ | 1 | × | ( | 1 | x | ) | = | 4 | x | x |
| - | x | x | x | x | + | 1 | + | x | ( | x | x | ) | − | 1 | ( | 1 | x | ) | = | 4 | x | x |
| - | x | x | x | x | + | 1 | + | x | x | x | − | 1 | ( | 1 | x | ) | = | 4 | x | x |
| - | x | x | x | x | + | 1 | + | x | x | x | − | 1 | × | 1 | x | = | 4 | x | x |
| - | x | x | x | x | + | 1 | + | x | x | x | − | 1 | x | = | 4 | x | x |