| ( | 40 100 | m | × | 40 100 | + | 40 100 | m | × | 3 | ÷ | 4 | ) | − | 15 | + | m | × | 60 100 | = | m |
| 方程左边 = | 40 100 | m | × | 40 100 | + | 40 100 | m | × | 3 | ÷ | 4 | − | 15 | + | 60 100 | m |
| = | 4 25 | m | + | 3 10 | m | − | 15 | + | 60 100 | m |
| = | 53 50 | m | − | 15 |
53 50 | m | − | 15 | = | m |
53 50 | m | − | m | = | 15 |
3 50 | m | = | 15 |
| m | = | 15 | ÷ | 3 50 |
| = | 15 | × | 50 3 |
| = | 5 | × | 50 |
| m | = | 250 |