| 1 | ÷ | d | + | 1 | ÷ | ( | 3 | + | d | ) | + | 1 | ÷ | ( | d | + | 5 | ) | = | 0 |
| 方程两边同时乘以: | d |
| 1 | + | 1 | ÷ | ( | 3 | + | d | ) | × | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | = | 0 |
| 方程两边同时乘以: | ( | 3 | + | d | ) |
| 1 | ( | 3 | + | d | ) | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | 3 | + | d | ) | = | 0 |
| 1 | × | 3 | + | 1 | d | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | 3 | + | d | ) | = | 0 |
| 3 | + | 1 | d | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | 3 | + | d | ) | = | 0 |
| 3 | + | 2 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | 3 | + | d | ) | = | 0 |
| 方程两边同时乘以: | ( | d | + | 5 | ) |
| 3 | ( | d | + | 5 | ) | + | 2 | d | ( | d | + | 5 | ) | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 3 | d | + | 3 | × | 5 | + | 2 | d | ( | d | + | 5 | ) | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 3 | d | + | 15 | + | 2 | d | ( | d | + | 5 | ) | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 3 | d | + | 15 | + | 2 | d | d | + | 2 | d | × | 5 | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 3 | d | + | 15 | + | 2 | d | d | + | 10 | d | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 13 | d | + | 15 | + | 2 | d | d | + | 1 | d | ( | 3 | + | d | ) | = | 0 |
| 13 | d | + | 15 | + | 2 | d | d | + | 1 | d | × | 3 | + | 1 | d | d | = | 0 |
| 13 | d | + | 15 | + | 2 | d | d | + | 3 | d | + | 1 | d | d | = | 0 |
| 16 | d | + | 15 | + | 2 | d | d | + | 1 | d | d | = | 0 |