| 15 | ( | 1 | + | m% | ) | ( | 1 | + | 1 2 | × | m% | ) | = | 66 |
| 方程左边 = | 15 | × | 1 | ( | 1 | + | 1 2 | × | m% | ) | + | 15 | × | m% | ( | 1 | + | 1 2 | × | m% | ) |
| = | 15 | ( | 1 | + | 1 2 | × | m% | ) | + | 3 20 | m | ( | 1 | + | 1 2 | × | m% | ) |
| = | 15 | × | 1 | + | 15 | × | 1 2 | × | m% | + | 3 20 | m | ( | 1 | + | 1 2 | × | m% | ) |
| = | 15 | + | 3 40 | m | + | 3 20 | m | ( | 1 | + | 1 2 | × | m% | ) |
| = | 15 | + | 3 40 | m | + | 3 20 | m | × | 1 | + | 3 20 | m | × | 1 2 | × | m% |
| = | 15 | + | 3 40 | m | + | 3 20 | m | + | 3 4000 | m | m |
| = | 15 | + | 9 40 | m | + | 3 4000 | m | m |
| 15 | + | 9 40 | m | + | 3 4000 | m | m | = | 66 |