| ( | 1 | + | x | ) | ( | 1 | + | 1 10 | x | ) | + | 1 2 | ( | x | + | 1 | ) | = | 12 |
| 方程左边 = | 1 | ( | 1 | + | 1 10 | x | ) | + | x | ( | 1 | + | 1 10 | x | ) | + | 1 2 | ( | x | + | 1 | ) |
| = | 1 | × | 1 | + | 1 | × | 1 10 | x | + | x | ( | 1 | + | 1 10 | x | ) | + | 1 2 | ( | x | + | 1 | ) |
| = | 1 | + | 1 10 | x | + | x | ( | 1 | + | 1 10 | x | ) | + | 1 2 | ( | x | + | 1 | ) |
| = | 1 | + | 1 10 | x | + | x | × | 1 | + | x | × | 1 10 | x | + | 1 2 | ( | x | + | 1 | ) |
| = | 1 | + | 11 10 | x | + | x | × | 1 10 | x | + | 1 2 | ( | x | + | 1 | ) |
| = | 1 | + | 11 10 | x | + | x | × | 1 10 | x | + | 1 2 | x | + | 1 2 | × | 1 |
| = | 1 | + | 11 10 | x | + | x | × | 1 10 | x | + | 1 2 | x | + | 1 2 |
| = | 3 2 | + | 8 5 | x | + | x | × | 1 10 | x |
3 2 | + | 8 5 | x | + | x | × | 1 10 | x | = | 12 |