| 150 | ( | 30 | ( | 1 | + | m% | ) | − | 20 | ) | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) | = | 2500 | + | 270 |
| 方程左边 = | 150 | × | 30 | ( | 1 | + | m% | ) | − | 150 | × | 20 | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) |
| = | 4500 | ( | 1 | + | m% | ) | − | 3000 | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) |
| = | 4500 | × | 1 | + | 4500 | × | m% | − | 3000 | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) |
| = | 4500 | + | 45 | m | − | 3000 | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) |
| = | 1500 | + | 45 | m | + | 150 | ( | 35 | ( | 1 | − | m% | ) | − | ( | 25 | − | 2 | ) | ) |
| = | 1500 | + | 45 | m | + | 150 | × | 35 | ( | 1 | − | m% | ) | − | 150 | ( | 25 | − | 2 | ) |
| = | 1500 | + | 45 | m | + | 5250 | ( | 1 | − | m% | ) | − | 150 | ( | 25 | − | 2 | ) |
| = | 1500 | + | 45 | m | + | 5250 | × | 1 | − | 5250 | × | m% | − | 150 | ( | 25 | − | 2 | ) |
| = | 1500 | + | 45 | m | + | 5250 | − | 105 2 | m | − | 150 | ( | 25 | − | 2 | ) |
| = | 6750 | − | 15 2 | m | − | 150 | ( | 25 | − | 2 | ) |
| = | 6750 | − | 15 2 | m | − | 150 | × | 25 | + | 150 | × | 2 |
| = | 6750 | − | 15 2 | m | − | 3750 | + | 300 |
| = | 3300 | − | 15 2 | m |
| 3300 | − | 15 2 | m | = | 2500 | + | 270 |
| 方程右边 = | 2770 |
| 3300 | − | 15 2 | m | = | 2770 |
| - | 15 2 | m | = | 2770 | − | 3300 |
| - | 15 2 | m | = | - | 530 |
| 530 | = | 15 2 | m |
15 2 | m | = | 530 |
| m | = | 530 | ÷ | 15 2 |
| = | 530 | × | 2 15 |
| = | 106 | × | 2 3 |
| m | = | 212 3 |
| m | = | 70.666667 |