| ( | 1 | + | m% | ) | × | 300 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | = | 66 |
| 方程左边 = | 1 | × | 300 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | + | m% | × | 300 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) | + | 3 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | × | 1 | + | 300 | ( | m | ÷ | 2 | ) | × | 1 100 | + | 3 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | + | 3 | ( | m | ÷ | 2 | ) | + | 3 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | + | 3 | m | ÷ | 2 | + | 3 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | + | 3 2 | m | + | 3 | m | ( | 1 | + | ( | m | ÷ | 2 | ) | × | 1 100 | ) |
| = | 300 | + | 3 2 | m | + | 3 | m | × | 1 | + | 3 | m | ( | m | ÷ | 2 | ) | × | 1 100 |
| = | 300 | + | 3 2 | m | + | 3 | m | + | 3 100 | m | ( | m | ÷ | 2 | ) |
| = | 300 | + | 3 2 | m | + | 3 | m | + | 3 100 | m | m | ÷ | 2 |
| = | 300 | + | 3 2 | m | + | 3 | m | + | 3 200 | m | m |
| 300 | + | 3 2 | m | + | 3 | m | + | 3 200 | m | m | = | 66 |