| 900 | ( | 600 | ( | 1 | − | m% | ) | ) | + | 120 | ( | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) | ) | = | 0 |
| 方程左边 = | 900 | × | 600 | ( | 1 | − | m% | ) | + | 120 | ( | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) | ) |
| = | 540000 | ( | 1 | − | m% | ) | + | 120 | ( | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) | ) |
| = | 540000 | × | 1 | − | 540000 | × | m% | + | 120 | ( | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) | ) |
| = | 540000 | − | 5400 | m | + | 120 | ( | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) | ) |
| = | 540000 | − | 5400 | m | + | 120 | × | 180 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) |
| = | 540000 | − | 5400 | m | + | 21600 | ( | 1 | − | 9 | ÷ | 5 | × | m% | ) |
| = | 540000 | − | 5400 | m | + | 21600 | × | 1 | − | 21600 | × | 9 | ÷ | 5 | × | m% |
| = | 540000 | − | 5400 | m | + | 21600 | − | 1944 5 | m |
| = | 561600 | − | 28944 5 | m |
| 561600 | − | 28944 5 | m | = | 0 |
| - | 28944 5 | m | = | 0 | − | 561600 |
| - | 28944 5 | m | = | - | 561600 |
| 561600 | = | 28944 5 | m |
28944 5 | m | = | 561600 |
| m | = | 561600 | ÷ | 28944 5 |
| = | 561600 | × | 5 28944 |
| = | 1300 | × | 5 67 |
| m | = | 6500 67 |
| m | = | 97.014925 |