| ( | 100 | + | 2 | x | ) | ( | 100 | + | 3 | x | ) | = | 27 25 |
| 方程左边 = | 100 | ( | 100 | + | 3 | x | ) | + | 2 | x | ( | 100 | + | 3 | x | ) |
| = | 100 | × | 100 | + | 100 | × | 3 | x | + | 2 | x | ( | 100 | + | 3 | x | ) |
| = | 10000 | + | 300 | x | + | 2 | x | ( | 100 | + | 3 | x | ) |
| = | 10000 | + | 300 | x | + | 2 | x | × | 100 | + | 2 | x | × | 3 | x |
| = | 10000 | + | 300 | x | + | 200 | x | + | 6 | x | x |
| = | 10000 | + | 500 | x | + | 6 | x | x |
| 10000 | + | 500 | x | + | 6 | x | x | = | 27 25 |