| 1 | ÷ | ( | d | + | 5 | ) | + | 1 | ÷ | ( | d | + | 2 | ) | = | 1 | ÷ | d |
| 方程两边同时乘以: | ( | d | + | 5 | ) | , | d |
| 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | ( | d | + | 5 | ) | d | = | 1 | ( | d | + | 5 | ) |
| 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | 5 | d | = | 1 | ( | d | + | 5 | ) |
| 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | 5 | d | = | 1 | d | + | 1 | × | 5 |
| 1 | d | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | d | + | 5 | ÷ | ( | d | + | 2 | ) | × | d | = | 1 | d | + | 5 |
| 方程两边同时乘以: | ( | d | + | 2 | ) |
| 1 | d | ( | d | + | 2 | ) | + | 1 | d | d | + | 5 | d | = | 1 | d | ( | d | + | 2 | ) | + | 5 | ( | d | + | 2 | ) |
| 1 | d | d | + | 1 | d | × | 2 | + | 1 | d | d | + | 5 | d | = | 1 | d | ( | d | + | 2 | ) | + | 5 | ( | d | + | 2 | ) |
| 1 | d | d | + | 1 | d | × | 2 | + | 1 | d | d | + | 5 | d | = | 1 | d | d | + | 1 | d | × | 2 | + | 5 | ( | d | + | 2 | ) |
| 1 | d | d | + | 2 | d | + | 1 | d | d | + | 5 | d | = | 1 | d | d | + | 2 | d | + | 5 | ( | d | + | 2 | ) |
| 1 | d | d | + | 7 | d | + | 1 | d | d | = | 1 | d | d | + | 2 | d | + | 5 | ( | d | + | 2 | ) |
| 1 | d | d | + | 7 | d | + | 1 | d | d | = | 1 | d | d | + | 2 | d | + | 5 | d | + | 5 | × | 2 |
| 1 | d | d | + | 7 | d | + | 1 | d | d | = | 1 | d | d | + | 2 | d | + | 5 | d | + | 10 |
| 1 | d | d | + | 7 | d | + | 1 | d | d | = | 1 | d | d | + | 7 | d | + | 10 |