| 1818 | × | 43 50 | ( | 80 | − | 157 2 | ) | + | 1818 | × | 375 | = | A |
| 方程左边 = | 39087 25 | ( | 80 | − | 157 2 | ) | + | 681750 |
39087 25 | ( | 80 | − | 157 2 | ) | + | 681750 | = | A |
| 方程左边 = | 39087 25 | × | 80 | − | 39087 25 | × | 157 2 | + | 681750 |
| = | 625392 5 | − | 6136659 50 | + | 681750 |
| = | 34204761 50 |
34204761 50 | = | A |
| - | A | = | - | 34204761 50 |
34204761 50 | = | A |
| A | = | 34204761 50 |