| 27 | = | ( | 27 | − | 3 2 | x | ) | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | − | 9 2 | x |
| 27 | = | 27 | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | − | 3 2 | x | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | − | 9 2 | x |
| 27 | = | 27 | × | 4 | ÷ | ( | 4 | + | x | ) | − | 3 2 | x | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | − | 9 2 | x |
| 27 | = | 108 | ÷ | ( | 4 | + | x | ) | − | 3 2 | x | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | − | 9 2 | x |
| 方程两边同时乘以: | ( | 4 | + | x | ) |
| 27 | ( | 4 | + | x | ) | = | 108 | − | 3 2 | x | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) |
| 27 | × | 4 | + | 27 | x | = | 108 | − | 3 2 | x | ( | 4 | ÷ | ( | 4 | + | x | ) | ) | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) |
| 27 | × | 4 | + | 27 | x | = | 108 | − | 3 2 | x | × | 4 | ÷ | ( | 4 | + | x | ) | × | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) |
| 108 | + | 27 | x | = | 108 | − | 6 | x | ÷ | ( | 4 | + | x | ) | × | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) |
| 方程两边同时乘以: | ( | 4 | + | x | ) |
| 108 | ( | 4 | + | x | ) | + | 27 | x | ( | 4 | + | x | ) | = | 108 | ( | 4 | + | x | ) | − | 6 | x | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 108 | × | 4 | + | 108 | x | + | 27 | x | ( | 4 | + | x | ) | = | 108 | ( | 4 | + | x | ) | − | 6 | x | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 108 | × | 4 | + | 108 | x | + | 27 | x | ( | 4 | + | x | ) | = | 108 | × | 4 | + | 108 | x | − | 6 | x | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 432 | + | 108 | x | + | 27 | x | ( | 4 | + | x | ) | = | 432 | + | 108 | x | − | 6 | x | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 432 | + | 108 | x | + | 27 | x | × | 4 | + | 27 | x | x | = | 432 | + | 108 | x | − | 6 | x | ( | 4 | + | x | ) | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 432 | + | 108 | x | + | 27 | x | × | 4 | + | 27 | x | x | = | 432 | + | 108 | x | − | 6 | x | × | 4 | − | 6 | x | x | − | 9 2 | x | ( | 4 | + | x | ) |
| 432 | + | 108 | x | + | 108 | x | + | 27 | x | x | = | 432 | + | 108 | x | − | 24 | x | − | 6 | x | x | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 84 | x | − | 6 | x | x | − | 9 2 | x | ( | 4 | + | x | ) | ( | 4 | + | x | ) |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 84 | x | − | 6 | x | x | − | 9 2 | x | × | 4 | ( | 4 | + | x | ) | − | 9 2 | x |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 84 | x | − | 6 | x | x | − | 18 | x | ( | 4 | + | x | ) | − | 9 2 | x | x |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 84 | x | − | 6 | x | x | − | 18 | x | × | 4 | − | 18 | x | x |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 84 | x | − | 6 | x | x | − | 72 | x | − | 18 | x | x | − | 9 2 |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 12 | x | − | 6 | x | x | − | 18 | x | x | − | 9 2 | x | x |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 12 | x | − | 6 | x | x | − | 18 | x | x | − | 9 2 | x | x |
| 432 | + | 216 | x | + | 27 | x | x | = | 432 | + | 12 | x | − | 6 | x | x | − | 18 | x | x | − | 18 | x | x |
| x1= | - | 34 3 |
| x2=0 |