| ( | 2200 | + | 2200 | m | ) | ( | 3 | − | 2 | m | ) | = | 6600 |
| 方程左边 = | 2200 | ( | 3 | − | 2 | m | ) | + | 2200 | m | ( | 3 | − | 2 | m | ) |
| = | 2200 | × | 3 | − | 2200 | × | 2 | m | + | 2200 | m | ( | 3 | − | 2 | m | ) |
| = | 6600 | − | 4400 | m | + | 2200 | m | ( | 3 | − | 2 | m | ) |
| = | 6600 | − | 4400 | m | + | 2200 | m | × | 3 | − | 2200 | m | × | 2 | m |
| = | 6600 | − | 4400 | m | + | 6600 | m | − | 4400 | m | m |
| = | 6600 | + | 2200 | m | − | 4400 | m | m |
| 6600 | + | 2200 | m | − | 4400 | m | m | = | 6600 |
| m2= | 1 2 |