| 1 | ÷ | d | + | 1 | ÷ | d | + | 1 | ÷ | ( | d | + | 2 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | = | 0 |
| 方程两边同时乘以: | d |
| 1 | + | 1 | ÷ | 1 | × | 1 | + | 1 | ÷ | ( | d | + | 2 | ) | × | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | = | 0 |
| 方程两边同时乘以: | ( | d | + | 2 | ) |
| 1 | ( | d | + | 2 | ) | + | 1 | ÷ | 1 | × | 1 | ( | d | + | 2 | ) | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 2 | ) | = | 0 |
| 1 | d | + | 1 | × | 2 | + | 1 | ÷ | 1 | × | 1 | ( | d | + | 2 | ) | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | = | 0 |
| 1 | d | + | 2 | + | 1 | ( | d | + | 2 | ) | + | 1 | d | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 2 | ) | = | 0 |
| 2 | d | + | 2 | + | 1 | ( | d | + | 2 | ) | + | 1 | ÷ | ( | d | + | 5 | ) | × | d | ( | d | + | 2 | ) | = | 0 |
| 方程两边同时乘以: | ( | d | + | 5 | ) |
| 2 | d | ( | d | + | 5 | ) | + | 2 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | + | 1 | d | ( | d | + | 2 | ) | = | 0 |
| 2 | d | d | + | 2 | d | × | 5 | + | 2 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | + | 1 | = | 0 |
| 2 | d | d | + | 10 | d | + | 2 | ( | d | + | 5 | ) | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | + | 1 | d | = | 0 |
| 2 | d | d | + | 10 | d | + | 2 | d | + | 2 | × | 5 | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | = | 0 |
| 2 | d | d | + | 10 | d | + | 2 | d | + | 10 | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | + | 1 | = | 0 |
| 2 | d | d | + | 12 | d | + | 10 | + | 1 | ( | d | + | 2 | ) | ( | d | + | 5 | ) | + | 1 | d | ( | d | + | 2 | ) | = | 0 |
| 2 | d | d | + | 12 | d | + | 10 | + | 1 | d | ( | d | + | 5 | ) | + | 1 | × | 2 | ( | d | + | 5 | ) | = | 0 |
| 2 | d | d | + | 12 | d | + | 10 | + | 1 | d | ( | d | + | 5 | ) | + | 2 | ( | d | + | 5 | ) | + | 1 | = | 0 |
| 2 | d | d | + | 12 | d | + | 10 | + | 1 | d | d | + | 1 | d | × | 5 | = | 0 |
| 2 | d | d | + | 12 | d | + | 10 | + | 1 | d | d | + | 5 | d | + | 2 | = | 0 |
| 2 | d | d | + | 17 | d | + | 10 | + | 1 | d | d | + | 2 | ( | d | + | 5 | ) | + | 1 | = | 0 |
| 2 | d | d | + | 17 | d | + | 10 | + | 1 | d | d | + | 2 | d | + | 2 | = | 0 |
| 2 | d | d | + | 17 | d | + | 10 | + | 1 | d | d | + | 2 | d | + | 10 | = | 0 |
| 2 | d | d | + | 19 | d | + | 20 | + | 1 | d | d | + | 1 | d | ( | d | + | 2 | ) | = | 0 |
| 2 | d | d | + | 19 | d | + | 20 | + | 1 | d | d | + | 1 | d | d | = | 0 |
| 2 | d | d | + | 19 | d | + | 20 | + | 1 | d | d | + | 1 | d | d | = | 0 |
| 2 | d | d | + | 21 | d | + | 20 | + | 1 | d | d | + | 1 | d | d | = | 0 |
| d2= | - | 5 4 |