| ( | x | + | 2 | ) | ( | 1 | ÷ | 2 | × | x | + | 1 | ) | = | 0 |
| 方程左边 = | x | ( | 1 | ÷ | 2 | × | x | + | 1 | ) | + | 2 | ( | 1 | ÷ | 2 | × | x | + | 1 | ) |
| = | x | × | 1 | ÷ | 2 | × | x | + | x | × | 1 | + | 2 | ( | 1 | ÷ | 2 | × | x | + | 1 | ) |
| = | x | × | 1 2 | x | + | x | × | 1 | + | 2 | ( | 1 | ÷ | 2 | × | x | + | 1 | ) |
| = | x | × | 1 2 | x | + | 1 | x | + | 2 | × | 1 | ÷ | 2 | × | x | + | 2 | × | 1 |
| = | x | × | 1 2 | x | + | 1 | x | + | 1 | x | + | 2 |
| = | x | × | 1 2 | x | + | 2 | x | + | 2 |
| x | × | 1 2 | x | + | 2 | x | + | 2 | = | 0 |