| ( | 14 | ( | 1 | + | 1 100 | m | ) | + | 4 | − | 16 | ) | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) | = | 324 | − | 14 |
| 方程左边 = | 14 | ( | 1 | + | 1 100 | m | ) | ( | 40 | − | 1 40 | m | ) | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 14 | × | 1 | ( | 40 | − | 1 40 | m | ) | + | 14 | × | 1 100 | m | ( | 40 | − | 1 40 | m | ) | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 |
| = | 14 | ( | 40 | − | 1 40 | m | ) | + | 7 50 | m | ( | 40 | − | 1 40 | m | ) | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 14 | × | 40 | − | 14 | × | 1 40 | m | + | 7 50 | m | ( | 40 | − | 1 40 | m | ) | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) |
| = | 560 | − | 7 20 | m | + | 7 50 | m | ( | 40 | − | 1 40 | m | ) | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 560 | − | 7 20 | m | + | 7 50 | m | × | 40 | − | 7 50 | m | × | 1 40 | m | + | 4 | ( | 40 | − | 1 40 | m | ) |
| = | 560 | − | 7 20 | m | + | 28 5 | m | − | 7 2000 | m | m | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) |
| = | 560 | + | 21 4 | m | − | 7 2000 | m | m | + | 4 | ( | 40 | − | 1 40 | m | ) | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 560 | + | 21 4 | m | − | 7 2000 | m | m | + | 4 | × | 40 | − | 4 | × | 1 40 | m | − | 16 |
| = | 560 | + | 21 4 | m | − | 7 2000 | m | m | + | 160 | − | 1 10 | m | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 |
| = | 720 | + | 103 20 | m | − | 7 2000 | m | m | − | 16 | ( | 40 | − | 1 40 | m | ) | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 720 | + | 103 20 | m | − | 7 2000 | m | m | − | 16 | × | 40 | + | 16 | × | 1 40 | m | + | 2 |
| = | 720 | + | 103 20 | m | − | 7 2000 | m | m | − | 640 | + | 2 5 | m | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 2 | ( | 80 | + | 12 5 | m | ) |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 2 | × | 80 | + | 2 | × | 12 5 | m |
| = | 80 | + | 111 20 | m | − | 7 2000 | m | m | + | 160 | + | 24 5 | m |
| = | 240 | + | 207 20 | m | − | 7 2000 | m | m |
| 240 | + | 207 20 | m | − | 7 2000 | m | m | = | 324 | − | 14 |
| 方程右边 = | 310 |
| 240 | + | 207 20 | m | − | 7 2000 | m | m | = | 310 |