| 1 | ÷ | x | + | 1 | ÷ | ( | 1 | + | x | ) | + | 1 | ÷ | ( | 7 2 | + | x | ) | = | 0 |
| 方程两边同时乘以: | x |
| 1 | + | 1 | ÷ | ( | 1 | + | x | ) | × | x | + | 1 | ÷ | ( | 7 2 | + | x | ) | × | x | = | 0 |
| 方程两边同时乘以: | ( | 1 | + | x | ) |
| 1 | ( | 1 | + | x | ) | + | 1 | x | + | 1 | ÷ | ( | 7 2 | + | x | ) | × | x | ( | 1 | + | x | ) | = | 0 |
| 1 | × | 1 | + | 1 | x | + | 1 | x | + | 1 | ÷ | ( | 7 2 | + | x | ) | × | x | ( | 1 | + | x | ) | = | 0 |
| 1 | + | 1 | x | + | 1 | x | + | 1 | ÷ | ( | 7 2 | + | x | ) | × | x | ( | 1 | + | x | ) | = | 0 |
| 1 | + | 2 | x | + | 1 | ÷ | ( | 7 2 | + | x | ) | × | x | ( | 1 | + | x | ) | = | 0 |
| 方程两边同时乘以: | ( | 7 2 | + | x | ) |
| 1 | ( | 7 2 | + | x | ) | + | 2 | x | ( | 7 2 | + | x | ) | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
| 1 | × | 7 2 | + | 1 | x | + | 2 | x | ( | 7 2 | + | x | ) | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
7 2 | + | 1 | x | + | 2 | x | ( | 7 2 | + | x | ) | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
7 2 | + | 1 | x | + | 2 | x | × | 7 2 | + | 2 | x | x | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
7 2 | + | 1 | x | + | 7 | x | + | 2 | x | x | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
7 2 | + | 8 | x | + | 2 | x | x | + | 1 | x | ( | 1 | + | x | ) | = | 0 |
7 2 | + | 8 | x | + | 2 | x | x | + | 1 | x | × | 1 | + | 1 | x | x | = | 0 |
7 2 | + | 8 | x | + | 2 | x | x | + | 1 | x | + | 1 | x | x | = | 0 |
7 2 | + | 9 | x | + | 2 | x | x | + | 1 | x | x | = | 0 |