| ( | 3 625 | − | x | ) | ( | 1 50 | − | x | ) | = | 11 100000000000 |
| 方程左边 = | 3 625 | ( | 1 50 | − | x | ) | − | x | ( | 1 50 | − | x | ) |
| = | 3 625 | × | 1 50 | − | 3 625 | x | − | x | ( | 1 50 | − | x | ) |
| = | 3 31250 | − | 3 625 | x | − | x | ( | 1 50 | − | x | ) |
| = | 3 31250 | − | 3 625 | x | − | x | × | 1 50 | + | x | x |
| = | 3 31250 | − | 31 1250 | x | + | x | x |
3 31250 | − | 31 1250 | x | + | x | x | = | 11 100000000000 |