121 5 | × | 121 5 | − | 167 10 | × | 167 10 | = | 3 | ( | 480 | − | s | − | 6 | × | 121 5 | ) |
| 方程左边 = | 14641 25 | − | 27889 100 |
| = | 1227 4 |
1227 4 | = | 3 | ( | 480 | − | s | − | 6 | × | 121 5 | ) |
| 方程右边 = | 3 | × | 480 | − | 3 | s | − | 3 | × | 6 | × | 121 5 |
| = | 1440 | − | 3 | s | − | 2178 5 |
| = | 5022 5 | − | 3 | s |
1227 4 | = | 5022 5 | − | 3 | s |
| 3 | s | = | 5022 5 | − | 1227 4 |
| 3 | s | = | 13953 20 |
| s | = | 13953 20 | ÷ | 3 |
| = | 13953 20 | × | 1 3 |
| = | 4651 20 | × | 1 |
| s | = | 4651 20 |
| s | = | 232.55 |