| 2500 | + | ( | 1 | + | x | ) | × | 2500 | + | 2500 | ( | 1 | + | x | ) | ( | x | + | 1 | ) | = | 9100 |
| 方程左边 = | 2500 | + | 1 | × | 2500 | + | x | × | 2500 | + | 2500 | ( | 1 | + | x | ) | ( | x | + | 1 | ) |
| = | 2500 | + | 2500 | + | x | × | 2500 | + | 2500 | ( | 1 | + | x | ) | ( | x | + | 1 | ) |
| = | 5000 | + | 2500 | x | + | 2500 | ( | 1 | + | x | ) | ( | x | + | 1 | ) |
| = | 5000 | + | 2500 | x | + | 2500 | × | 1 | ( | x | + | 1 | ) | + | 2500 | x | ( | x | + | 1 | ) |
| = | 5000 | + | 2500 | x | + | 2500 | ( | x | + | 1 | ) | + | 2500 | x | ( | x | + | 1 | ) |
| = | 5000 | + | 2500 | x | + | 2500 | x | + | 2500 | × | 1 | + | 2500 | x | ( | x | + | 1 | ) |
| = | 5000 | + | 2500 | x | + | 2500 | x | + | 2500 | + | 2500 | x | ( | x | + | 1 | ) |
| = | 7500 | + | 5000 | x | + | 2500 | x | ( | x | + | 1 | ) |
| = | 7500 | + | 5000 | x | + | 2500 | x | x | + | 2500 | x | × | 1 |
| = | 7500 | + | 5000 | x | + | 2500 | x | x | + | 2500 | x |
| = | 7500 | + | 7500 | x | + | 2500 | x | x |
| 7500 | + | 7500 | x | + | 2500 | x | x | = | 9100 |
| x1= | - | 16 5 |
| x2= | 1 5 |