| ( | 200 | + | m | ) | ( | 50 | − | 1 | ÷ | 5 | × | m | ) | = | 10800 |
| 方程左边 = | 200 | ( | 50 | − | 1 | ÷ | 5 | × | m | ) | + | m | ( | 50 | − | 1 | ÷ | 5 | × | m | ) |
| = | 200 | × | 50 | − | 200 | × | 1 | ÷ | 5 | × | m | + | m | ( | 50 | − | 1 | ÷ | 5 | × | m | ) |
| = | 10000 | − | 40 | m | + | m | ( | 50 | − | 1 | ÷ | 5 | × | m | ) |
| = | 10000 | − | 40 | m | + | m | × | 50 | − | m | × | 1 | ÷ | 5 | × | m |
| = | 10000 | − | 40 | m | + | m | × | 50 | − | m | × | 1 5 | m |
| = | 10000 | + | 10 | m | − | m | × | 1 5 | m |
| 10000 | + | 10 | m | − | m | × | 1 5 | m | = | 10800 |