| 1000 | ( | x | + | 1 | ) | ( | x | + | 1 10 | + | 1 | ) | = | 1560 |
| 方程左边 = | 1000 | x | ( | x | + | 1 10 | + | 1 | ) | + | 1000 | × | 1 | ( | x | + | 1 10 | + | 1 | ) |
| = | 1000 | x | ( | x | + | 1 10 | + | 1 | ) | + | 1000 | ( | x | + | 1 10 | + | 1 | ) |
| = | 1000 | x | x | + | 1000 | x | × | 1 10 | + | 1000 | x | × | 1 | + | 1000 | ( | x | + | 1 10 | + | 1 | ) |
| = | 1000 | x | x | + | 100 | x | + | 1000 | x | + | 1000 | ( | x | + | 1 10 | + | 1 | ) |
| = | 1000 | x | x | + | 1100 | x | + | 1000 | ( | x | + | 1 10 | + | 1 | ) |
| = | 1000 | x | x | + | 1100 | x | + | 1000 | x | + | 1000 | × | 1 10 | + | 1000 | × | 1 |
| = | 1000 | x | x | + | 1100 | x | + | 1000 | x | + | 100 | + | 1000 |
| = | 1000 | x | x | + | 2100 | x | + | 1100 |
| 1000 | x | x | + | 2100 | x | + | 1100 | = | 1560 |
| x1= | - | 23 10 |
| x2= | 1 5 |