| 12 | ( | 1 | − | 10 | × | m% | ÷ | 3 | ) | × | 1200 | ( | 1 | + | 6 | × | m% | ) | + | 50 | ( | 1 | − | 4 | × | m% | ) | × | 800 | ( | 1 | − | 4 | × | m% | ) | = | 54400 | − | 80 | m |
| 方程左边 = | 14400 | ( | 1 | − | 10 | × | m% | ÷ | 3 | ) | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| 14400 | ( | 1 | − | 10 | × | m% | ÷ | 3 | ) | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) | = | 54400 | − | 80 | m |
| 方程左边 = | 14400 | × | 1 | ( | 1 | + | 6 | × | m% | ) | − | 14400 | × | 10 | × | m% | ÷ | 3 | × | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | ( | 1 | + | 6 | × | m% | ) | − | 480 | m | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | × | 1 | + | 14400 | × | 6 | × | m% | − | 480 | m | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 864 | m | − | 480 | m | ( | 1 | + | 6 | × | m% | ) | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 864 | m | − | 480 | m | × | 1 | − | 480 | m | × | 6 | × | m% | + | 40000 | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 864 | m | − | 480 | m | − | 144 5 | m | m | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 384 | m | − | 144 5 | m | m | + | 40000 | ( | 1 | − | 4 | × | m% | ) | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 384 | m | − | 144 5 | m | m | + | 40000 | × | 1 | ( | 1 | − | 4 | × | m% | ) | − | 40000 | × | 4 | × | m% |
| = | 14400 | + | 384 | m | − | 144 5 | m | m | + | 40000 | ( | 1 | − | 4 | × | m% | ) | − | 1600 | m | ( | 1 | − | 4 | × | m% | ) |
| = | 14400 | + | 384 | m | − | 144 5 | m | m | + | 40000 | × | 1 | − | 40000 | × | 4 | × | m% | − | 1600 |
| = | 14400 | + | 384 | m | − | 144 5 | m | m | + | 40000 | − | 1600 | m | − | 1600 | m | ( | 1 | − | 4 | × | m% | ) |
| = | 54400 | − | 1216 | m | − | 144 5 | m | m | − | 1600 | m | ( | 1 | − | 4 | × | m% | ) |
| = | 54400 | − | 1216 | m | − | 144 5 | m | m | − | 1600 | m | × | 1 | + | 1600 | m | × | 4 |
| = | 54400 | − | 1216 | m | − | 144 5 | m | m | − | 1600 | m | + | 64 | m | m |
| = | 54400 | − | 2816 | m | − | 144 5 | m | m | + | 64 | m | m |
| 54400 | − | 2816 | m | − | 144 5 | m | m | + | 64 | m | m | = | 54400 | − | 80 | m |