| ( | 5 2 | − | 1 2 | + | 7 50 | m | ) | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) | = | 324 | − | 14 |
| 方程左边 = | 5 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 5 2 | × | 120 | − | 5 2 | × | 80 | − | 5 2 | ( | 1 | ÷ | 40 | ) | m | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) |
| = | 300 | − | 200 | − | 5 2 | ( | 1 | ÷ | 40 | ) | m | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 100 | − | 5 2 | ( | 1 | ÷ | 40 | ) | m | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 100 | − | 5 2 | × | 1 | ÷ | 40 | × | m | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 100 | − | 1 16 | m | − | 1 2 | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 100 | − | 1 16 | m | − | 1 2 | × | 120 | + | 1 2 | × | 80 | + | 1 2 | ( | 1 | ÷ | 40 | ) | m | + | 7 50 | m |
| = | 100 | − | 1 16 | m | − | 60 | + | 40 | + | 1 2 | ( | 1 | ÷ | 40 | ) | m | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) |
| = | 80 | − | 1 16 | m | + | 1 2 | ( | 1 | ÷ | 40 | ) | m | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | − | 1 16 | m | + | 1 2 | × | 1 | ÷ | 40 | × | m | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | − | 1 16 | m | + | 1 80 | m | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | − | 1 20 | m | + | 7 50 | m | ( | 120 | − | 80 | − | ( | 1 | ÷ | 40 | ) | m | ) | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | − | 1 20 | m | + | 7 50 | m | × | 120 | − | 7 50 | m | × | 80 | − | 7 50 | m | ( | 1 | ÷ | 40 | ) |
| = | 80 | − | 1 20 | m | + | 84 5 | m | − | 56 5 | m | − | 7 50 | m | ( | 1 | ÷ | 40 | ) | m | + | ( | 14 5 | − | 4 5 | ) |
| = | 80 | + | 111 20 | m | − | 7 50 | m | ( | 1 | ÷ | 40 | ) | m | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 50 | m | × | 1 | ÷ | 40 | × | m | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | ( | 14 5 | − | 4 5 | ) | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 14 5 | ( | 80 | + | 12 5 | m | ) | − | 4 5 | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 14 5 | × | 80 | + | 14 5 | × | 12 5 | m | − | 4 5 |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 224 | + | 168 25 | m | − | 4 5 | ( | 80 | + | 12 5 | m | ) |
| = | 304 | + | 1227 100 | m | − | 7 2000 | m | m | − | 4 5 | ( | 80 | + | 12 5 | m | ) |
| = | 304 | + | 1227 100 | m | − | 7 2000 | m | m | − | 4 5 | × | 80 | − | 4 5 | × | 12 5 | m |
| = | 304 | + | 1227 100 | m | − | 7 2000 | m | m | − | 64 | − | 48 25 | m |
| = | 240 | + | 207 20 | m | − | 7 2000 | m | m |
| 240 | + | 207 20 | m | − | 7 2000 | m | m | = | 324 | − | 14 |