| 1 | ÷ | x | + | 1 | ÷ | ( | x | + | 4 | ) | + | ( | 2 | x | + | 4 | ) | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | = | 0 |
| 方程两边同时乘以: | x |
| 1 | + | 1 | ÷ | ( | x | + | 4 | ) | × | x | + | ( | 2 | x | + | 4 | ) | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | = | 0 |
| 1 | + | 1 | ÷ | ( | x | + | 4 | ) | × | x | + | 2 | x | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | + | 4 | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | = | 0 |
| 方程两边同时乘以: | ( | x | + | 4 | ) |
| 1 | ( | x | + | 4 | ) | + | 1 | x | + | 2 | x | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | ( | x | + | 4 | ) | + | 4 | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | = | 0 |
| 1 | x | + | 1 | × | 4 | + | 1 | x | + | 2 | x | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | ( | x | + | 4 | ) | + | 4 | = | 0 |
| 1 | x | + | 4 | + | 1 | x | + | 2 | x | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | ( | x | + | 4 | ) | + | 4 | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | = | 0 |
| 2 | x | + | 4 | + | 2 | x | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | ( | x | + | 4 | ) | + | 4 | ÷ | ( | x | x | + | 4 | x | + | 20 | ) | × | x | ( | x | + | 4 | ) | = | 0 |
| 方程两边同时乘以: | ( | x | x | + | 4 | x | + | 20 | ) |
| 2 | x | ( | x | x | + | 4 | x | + | 20 | ) | + | 4 | ( | x | x | + | 4 | x | + | 20 | ) | + | 2 | x | x | ( | x | + | 4 | ) | + | 4 | x | ( | x | + | 4 | ) | = | 0 |
| 2 | x | x | x | + | 2 | x | × | 4 | x | + | 2 | x | × | 20 | + | 4 | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 40 | x | + | 4 | ( | x | x | + | 4 | x | + | 20 | ) | + | 2 | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 40 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 40 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 56 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 56 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 56 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 56 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 56 | x | + | 4 | x | x | = | 0 |
| 2 | x | x | x | + | 8 | x | x | + | 72 | x | + | 4 | x | x | = | 0 |