177 1000000000000 | = | ( | 1 125 | − | x | ) | ( | 567 5000 | − | x | ) |
| 方程右边 = | 1 125 | ( | 567 5000 | − | x | ) | − | x | ( | 567 5000 | − | x | ) |
| = | 1 125 | × | 567 5000 | − | 1 125 | x | − | x | ( | 567 5000 | − | x | ) |
| = | 567 625000 | − | 1 125 | x | − | x | ( | 567 5000 | − | x | ) |
| = | 567 625000 | − | 1 125 | x | − | x | × | 567 5000 | + | x | x |
| = | 567 625000 | − | 607 5000 | x | + | x | x |
177 1000000000000 | = | 567 625000 | − | 607 5000 | x | + | x | x |