| ( | 500 | ( | 1 | + | m% | ) | ) | ( | 1000 | + | 1 2 | × | m% | ) | = | 660000 |
| 方程左边 = | 500 | ( | 1 | + | m% | ) | ( | 1000 | + | 1 2 | × | m% | ) |
| = | 500 | × | 1 | ( | 1000 | + | 1 2 | × | m% | ) | + | 500 | × | m% | ( | 1000 | + | 1 2 | × | m% | ) |
| = | 500 | ( | 1000 | + | 1 2 | × | m% | ) | + | 5 | m | ( | 1000 | + | 1 2 | × | m% | ) |
| = | 500 | × | 1000 | + | 500 | × | 1 2 | × | m% | + | 5 | m | ( | 1000 | + | 1 2 | × | m% | ) |
| = | 500000 | + | 5 2 | m | + | 5 | m | ( | 1000 | + | 1 2 | × | m% | ) |
| = | 500000 | + | 5 2 | m | + | 5 | m | × | 1000 | + | 5 | m | × | 1 2 | × | m% |
| = | 500000 | + | 5 2 | m | + | 5000 | m | + | 1 40 | m | m |
| = | 500000 | + | 10005 2 | m | + | 1 40 | m | m |
| 500000 | + | 10005 2 | m | + | 1 40 | m | m | = | 660000 |