1 1000 | + | x | − | 16 5 | ( | 1 100 | − | x | ) | ( | 1 10 | − | x | ) | = | 0 |
| 方程左边 = | 1 1000 | + | x | − | 16 5 | × | 1 100 | ( | 1 10 | − | x | ) | + | 16 5 | x | ( | 1 10 | − | x | ) |
| = | 1 1000 | + | x | − | 4 125 | ( | 1 10 | − | x | ) | + | 16 5 | x | ( | 1 10 | − | x | ) |
| = | 1 1000 | + | x | − | 4 125 | × | 1 10 | + | 4 125 | x | + | 16 5 | x | ( | 1 10 | − | x | ) |
| = | 1 1000 | + | x | − | 2 625 | + | 4 125 | x | + | 16 5 | x | ( | 1 10 | − | x | ) |
| = | - | 11 5000 | + | 129 125 | x | + | 16 5 | x | ( | 1 10 | − | x | ) |
| = | - | 11 5000 | + | 129 125 | x | + | 16 5 | x | × | 1 10 | − | 16 5 | x | x |
| = | - | 11 5000 | + | 129 125 | x | + | 8 25 | x | − | 16 5 | x | x |
| = | - | 11 5000 | + | 169 125 | x | − | 16 5 | x | x |
| - | 11 5000 | + | 169 125 | x | − | 16 5 | x | x | = | 0 |