| 5 | ÷ | ( | a | ( | a | + | 1 | ) | ( | a | + | 1 2 | ) | ) | = | 1 |
| 方程两边同时乘以: | ( | a | ( | a | + | 1 | ) | ( | a | + | 1 2 | ) | ) |
| 5 | = | 1 | ( | a | ( | a | + | 1 | ) | ( | a | + | 1 2 | ) | ) |
| 5 | = | 1 | a | ( | a | + | 1 | ) | ( | a | + | 1 2 | ) |
| 5 | = | 1 | a | a | ( | a | + | 1 2 | ) | + | 1 | a | × | 1 | ( | a | + | 1 2 | ) |
| 5 | = | 1 | a | a | ( | a | + | 1 2 | ) | + | 1 | a | ( | a | + | 1 2 | ) |
| 5 | = | 1 | a | a | a | + | 1 | a | a | × | 1 2 | + | 1 | a | ( | a | + | 1 2 | ) |
| 5 | = | 1 | a | a | a | + | 1 2 | a | a | + | 1 | a | ( | a | + | 1 2 | ) |
| 5 | = | 1 | a | a | a | + | 1 2 | a | a | + | 1 | a | a | + | 1 | a |
| 5 | = | 1 | a | a | a | + | 1 2 | a | a | + | 1 | a | a | + | 1 2 | a |