| 1 | ÷ | s | + | 1 | ÷ | ( | s | + | 3 | ) | + | 1 | ÷ | ( | s | + | 5 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | = | 0 |
| 方程两边同时乘以: | s |
| 1 | + | 1 | ÷ | ( | s | + | 3 | ) | × | s | + | 1 | ÷ | ( | s | + | 5 | ) | × | s | − | 1 | ÷ | ( | s | + | 7 | ) | × | s | = | 0 |
| 方程两边同时乘以: | ( | s | + | 3 | ) |
| 1 | ( | s | + | 3 | ) | + | 1 | s | + | 1 | ÷ | ( | s | + | 5 | ) | × | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | × | s | ( | s | + | 3 | ) | = | 0 |
| 1 | s | + | 1 | × | 3 | + | 1 | s | + | 1 | ÷ | ( | s | + | 5 | ) | × | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | = | 0 |
| 1 | s | + | 3 | + | 1 | s | + | 1 | ÷ | ( | s | + | 5 | ) | × | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | × | s | = | 0 |
| 2 | s | + | 3 | + | 1 | ÷ | ( | s | + | 5 | ) | × | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | × | s | ( | s | + | 3 | ) | = | 0 |
| 方程两边同时乘以: | ( | s | + | 5 | ) |
| 2 | s | ( | s | + | 5 | ) | + | 3 | ( | s | + | 5 | ) | + | 1 | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | × | s | ( | s | + | 3 | ) | = | 0 |
| 2 | s | s | + | 2 | s | × | 5 | + | 3 | ( | s | + | 5 | ) | + | 1 | s | ( | s | + | 3 | ) | − | 1 | = | 0 |
| 2 | s | s | + | 10 | s | + | 3 | ( | s | + | 5 | ) | + | 1 | s | ( | s | + | 3 | ) | − | 1 | ÷ | ( | s | + | 7 | ) | = | 0 |
| 方程两边同时乘以: | ( | s | + | 7 | ) |
| 2 | s | s | ( | s | + | 7 | ) | + | 10 | s | ( | s | + | 7 | ) | + | 3 | ( | s | + | 5 | ) | ( | s | + | 7 | ) | + | 1 | s | = | 0 |
| 2 | s | s | s | + | 2 | s | s | × | 7 | + | 10 | s | ( | s | + | 7 | ) | + | 3 | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | ( | s | + | 7 | ) | + | 3 | ( | s | + | 5 | ) | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 10 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 70 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 70 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 70 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 70 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 70 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 91 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 91 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 91 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 106 | s | = | 0 |
| 2 | s | s | s | + | 14 | s | s | + | 10 | s | s | + | 106 | s | = | 0 |