| ( | 37 20 | a | + | 650 | ) | ÷ | 529 500 | = | 1000 |
| 方程左边 = | 37 20 | a | × | 500 529 | + | 650 | × | 500 529 |
| = | 925 529 | a | + | 325000 529 |
925 529 | a | + | 325000 529 | = | 1000 |
925 529 | a | = | 1000 | − | 325000 529 |
925 529 | a | = | 204000 529 |
| a | = | 204000 529 | ÷ | 925 529 |
| = | 204000 529 | × | 529 925 |
| = | 8160 | × | 1 37 |
| a | = | 8160 37 |
| a | = | 220.540541 |