| ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 | ÷ | 2 | = | 0 |
| 方程左边 = | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 2 |
| ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 2 | = | 0 |
| 方程左边 = | x | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | ÷ | 2 | × | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 2 |
| = | x | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 2 | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 2 |
| = | x | x | ( | x | − | 5 | ÷ | 2 | ) | − | x | × | 3 | ÷ | 2 | × | ( | x | − | 5 | ÷ | 2 | ) | − | 3 2 | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x |
| = | x | x | ( | x | − | 5 | ÷ | 2 | ) | − | x | × | 3 2 | ( | x | − | 5 | ÷ | 2 | ) | − | 3 2 | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) | − | 3 | x | + | 7 2 |
| = | x | x | x | − | x | x | × | 5 | ÷ | 2 | − | x | × | 3 2 | ( | x | − | 5 | ÷ | 2 | ) | − | 3 2 | ( | x | − | 3 | ÷ | 2 | ) |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | ( | x | − | 5 | ÷ | 2 | ) | − | 3 2 | ( | x | − | 3 | ÷ | 2 | ) | ( | x | − | 5 | ÷ | 2 | ) |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | x | × | 3 2 | × | 5 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | x | × | 15 4 | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 3 4 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 3 4 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 3 4 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 3 4 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 3 4 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 9 2 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 9 2 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 9 2 | x | − | 3 2 |
| = | x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 27 4 | x | − | 3 2 |
| x | x | x | − | x | x | × | 5 2 | − | x | × | 3 2 | x | + | 27 4 | x | − | 3 2 | = | 0 |
| x1= | 1 2 |