| ( | 13 | ÷ | 2 | − | 1 2 | x | x | ) | × | 5 2 | − | ( | 2 | − | x | ) | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) | = | 5 |
| 方程左边 = | 13 | ÷ | 2 | × | 5 2 | − | 1 2 | x | x | × | 5 2 | − | ( | 2 | − | x | ) | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) |
| = | 65 4 | − | 5 4 | x | x | − | ( | 2 | − | x | ) | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) |
| = | 65 4 | − | 5 4 | x | x | − | 2 | ( | 2 | − | x | x | ) | + | x | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) |
| = | 65 4 | − | 5 4 | x | x | − | 2 | × | 2 | + | 2 | x | x | + | x | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) |
| = | 65 4 | − | 5 4 | x | x | − | 4 | + | 2 | x | x | + | x | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | x | ( | 2 | − | x | x | ) | − | ( | 9 | ÷ | 4 | − | x | x | ÷ | 4 | ) | ( | x | + | 3 | ) |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | x | × | 2 | − | x | x | x |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | 2 | x | − | x | x | x |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | 2 | x | − | x | x | x |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | 2 | x | − | x | x | x |
| = | 49 4 | − | 5 4 | x | x | + | 2 | x | x | + | 2 | x | − | x | x | x |
| = | 11 2 | − | 5 4 | x | x | + | 2 | x | x | − | 1 4 | x | − | x | x | x |
| = | 11 2 | − | 5 4 | x | x | + | 2 | x | x | − | 1 4 | x | − | x | x | x |
| = | 11 2 | − | 5 4 | x | x | + | 2 | x | x | − | 1 4 | x | − | x | x | x |
11 2 | − | 5 4 | x | x | + | 2 | x | x | − | 1 4 | x | − | x | x | x | = | 5 |