| 1 | ÷ | d | + | 1 | ÷ | ( | d | + | 2 | ) | = | 1 | ÷ | ( | 1 | − | d | ) |
| 方程两边同时乘以: | d | , | ( | 1 | − | d | ) |
| 1 | ( | 1 | − | d | ) | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | ( | 1 | − | d | ) | = | 1 | d |
| 1 | × | 1 | − | 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | ( | 1 | − | d | ) | = | 1 | d |
| 1 | − | 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | ( | 1 | − | d | ) | = | 1 | d |
| 方程两边同时乘以: | ( | d | + | 2 | ) |
| 1 | ( | d | + | 2 | ) | − | 1 | d | ( | d | + | 2 | ) | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | ( | d | + | 2 | ) |
| 1 | d | + | 1 | × | 2 | − | 1 | d | ( | d | + | 2 | ) | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | ( | d | + | 2 | ) |
| 1 | d | + | 1 | × | 2 | − | 1 | d | ( | d | + | 2 | ) | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | d | + | 1 | d | × | 2 |
| 1 | d | + | 2 | − | 1 | d | ( | d | + | 2 | ) | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | d | + | 2 | d |
| 1 | d | + | 2 | − | 1 | d | d | − | 1 | d | × | 2 | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | d | + | 2 | d |
| 1 | d | + | 2 | − | 1 | d | d | − | 2 | d | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | d | + | 2 | d |
| - | 1 | d | + | 2 | − | 1 | d | d | + | 1 | d | ( | 1 | − | d | ) | = | 1 | d | d | + | 2 | d |
| - | 1 | d | + | 2 | − | 1 | d | d | + | 1 | d | × | 1 | − | 1 | d | d | = | 1 | d | d | + | 2 | d |
| - | 1 | d | + | 2 | − | 1 | d | d | + | 1 | d | − | 1 | d | d | = | 1 | d | d | + | 2 | d |
| - | 0 | d | + | 2 | − | 1 | d | d | − | 1 | d | d | = | 1 | d | d | + | 2 | d |