| ( | 1 | + | m% | ) | × | 300 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | × | 1000 | = | 660000 |
| 方程左边 = | ( | 1 | + | m% | ) | × | 300000 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| ( | 1 | + | m% | ) | × | 300000 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | = | 660000 |
| 方程左边 = | 1 | × | 300000 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | + | m% | × | 300000 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | + | 3000 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | × | 1 | + | 300000 | ( | m | ÷ | 2 | ) | × | 1 100 | + | 3000 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | + | 3000 | ( | m | ÷ | 2 | ) | + | 3000 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | + | 3000 | m | ÷ | 2 | + | 3000 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | + | 1500 | m | + | 3000 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300000 | + | 1500 | m | + | 3000 | m | × | 1 | + | 3000 | m | ( | m | ÷ | 2 | ) | × | 1 100 |
| = | 300000 | + | 1500 | m | + | 3000 | m | + | 30 | m | ( | m | ÷ | 2 | ) |
| = | 300000 | + | 1500 | m | + | 3000 | m | + | 30 | m | m | ÷ | 2 |
| = | 300000 | + | 1500 | m | + | 3000 | m | + | 15 | m | m |
| 300000 | + | 1500 | m | + | 3000 | m | + | 15 | m | m | = | 660000 |