| 1 | ÷ | d | + | 1 | ÷ | ( | d | + | 3 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | = | 1 | ÷ | ( | d | + | 7 | ) |
| 方程两边同时乘以: | d | , | ( | d | + | 7 | ) |
| 1 | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 3 | ) | × | d | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 7 | ) | = | 1 | d |
| 1 | d | + | 1 | × | 7 | + | 1 | ÷ | ( | d | + | 3 | ) | × | d | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 7 | ) | = | 1 | d |
| 1 | d | + | 7 | + | 1 | ÷ | ( | d | + | 3 | ) | × | d | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 7 | ) | = | 1 | d |
| 方程两边同时乘以: | ( | d | + | 3 | ) |
| 1 | d | ( | d | + | 3 | ) | + | 7 | ( | d | + | 3 | ) | + | 1 | d | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 7 | ) | = | 1 | d | ( | d | + | 3 | ) |
| 1 | d | d | + | 1 | d | × | 3 | + | 7 | ( | d | + | 3 | ) | + | 1 | d | ( | d | + | 7 | ) | + | 1 | = | 1 | d | ( | d | + | 3 | ) |
| 1 | d | d | + | 1 | d | × | 3 | + | 7 | ( | d | + | 3 | ) | + | 1 | d | ( | d | + | 7 | ) | + | 1 | = | 1 | d | d | + | 1 | d | × | 3 |
| 1 | d | d | + | 3 | d | + | 7 | ( | d | + | 3 | ) | + | 1 | d | ( | d | + | 7 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | = | 1 | d | d | + | 3 | d |
| 方程两边同时乘以: | ( | d | + | 5 | ) |
| 1 | d | d | ( | d | + | 5 | ) | + | 3 | d | ( | d | + | 5 | ) | + | 7 | ( | d | + | 3 | ) | ( | d | + | 5 | ) | + | 1 | d | = | 1 | d | d | ( | d | + | 5 | ) | + | 3 | d | ( | d | + | 5 | ) |
| 1 | d | d | d | + | 1 | d | d | × | 5 | + | 3 | d | ( | d | + | 5 | ) | + | 7 | = | 1 | d | d | ( | d | + | 5 | ) | + | 3 | d | ( | d | + | 5 | ) |
| 1 | d | d | d | + | 1 | d | d | × | 5 | + | 3 | d | ( | d | + | 5 | ) | + | 7 | = | 1 | d | d | d | + | 1 | d | d | × | 5 | + | 3 | d | ( | d | + | 5 | ) |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | ( | d | + | 5 | ) | + | 7 | ( | d | + | 3 | ) | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | ( | d | + | 5 | ) |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 3 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | ( | d | + | 5 | ) |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 3 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 3 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 50 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 50 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 50 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |
| 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 71 | d | = | 1 | d | d | d | + | 5 | d | d | + | 3 | d | d | + | 15 | d |