| 3000 | ( | 1 | + | 2 | x | ) | × | 55 100 | ( | 1 | + | x | ) | = | 2025 |
| 方程左边 = | 1650 | ( | 1 | + | 2 | x | ) | ( | 1 | + | x | ) |
| 1650 | ( | 1 | + | 2 | x | ) | ( | 1 | + | x | ) | = | 2025 |
| 方程左边 = | 1650 | × | 1 | ( | 1 | + | x | ) | + | 1650 | × | 2 | x | ( | 1 | + | x | ) |
| = | 1650 | ( | 1 | + | x | ) | + | 3300 | x | ( | 1 | + | x | ) |
| = | 1650 | × | 1 | + | 1650 | x | + | 3300 | x | ( | 1 | + | x | ) |
| = | 1650 | + | 1650 | x | + | 3300 | x | ( | 1 | + | x | ) |
| = | 1650 | + | 1650 | x | + | 3300 | x | × | 1 | + | 3300 | x | x |
| = | 1650 | + | 1650 | x | + | 3300 | x | + | 3300 | x | x |
| = | 1650 | + | 4950 | x | + | 3300 | x | x |
| 1650 | + | 4950 | x | + | 3300 | x | x | = | 2025 |