| ( | 3 25 | − | x | ) | ( | 3 25 | − | x | ) | = | ( | 2 5 | − | x | ) | ( | 2 25 | − | x | ) |
| 方程左边 = | 3 25 | ( | 3 25 | − | x | ) | − | x | ( | 3 25 | − | x | ) |
| = | 3 25 | × | 3 25 | − | 3 25 | x | − | x | ( | 3 25 | − | x | ) |
| = | 9 625 | − | 3 25 | x | − | x | ( | 3 25 | − | x | ) |
| = | 9 625 | − | 3 25 | x | − | x | × | 3 25 | + | x | x |
| = | 9 625 | − | 6 25 | x | + | x | x |
9 625 | − | 6 25 | x | + | x | x | = | ( | 2 5 | − | x | ) | ( | 2 25 | − | x | ) |
| 方程右边 = | 2 5 | ( | 2 25 | − | x | ) | − | x | ( | 2 25 | − | x | ) |
| = | 2 5 | × | 2 25 | − | 2 5 | x | − | x | ( | 2 25 | − | x | ) |
| = | 4 125 | − | 2 5 | x | − | x | ( | 2 25 | − | x | ) |
| = | 4 125 | − | 2 5 | x | − | x | × | 2 25 | + | x | x |
| = | 4 125 | − | 12 25 | x | + | x | x |
9 625 | − | 6 25 | x | + | x | x | = | 4 125 | − | 12 25 | x | + | x | x |
| x= | 11 150 |