| 18 | − | 1 2 | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | = | v | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) | − | 5 4 | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 18 | − | 1 2 | × | 2 | v | ÷ | 3 | × | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | − | 1 2 | × | 125 | ÷ | 3 | ÷ | v | × | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | + | 1 2 | = | v | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) | − | 5 4 | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 18 | − | 1 2 | × | 2 | v | ÷ | 3 | × | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | − | 1 2 | × | 125 | ÷ | 3 | ÷ | v | × | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | + | 1 2 | = | v | × | 2 | v | ÷ | 3 | + | v | × | 50 | ÷ | 3 | ÷ | v | − | v | × | 2 | − | 5 4 | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 18 | − | 1 3 | v | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | − | 125 6 | ÷ | v | × | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | + | 5 2 | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | = | v | × | 2 3 | v | + | v | × | 50 3 | ÷ | v | − | v | × | 2 | − | 5 4 | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 方程两边同时乘以: | v |
| 18 | v | − | 1 3 | v | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | v | − | 125 6 | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | + | 5 2 | ( | 2 | v | ÷ | 3 | + | 125 | ÷ | 3 | ÷ | v | − | 5 | ) | v | = | v | × | 2 3 | v | v | + | 1 | × | 50 3 | ÷ | 1 | × | v | − | 2 | v | v | − | 5 4 |
| 18 | v | − | 1 3 | v | × | 2 | v | ÷ | 3 | × | v | − | 1 3 | v | × | 125 | ÷ | 3 | = | v | × | 2 3 | v | v | + | 1 | × | 50 3 | ÷ | 1 | × | v | − | 2 | v | v | − | 5 4 |
| 18 | v | − | 1 3 | v | × | 2 | v | ÷ | 3 | × | v | − | 1 3 | v | × | 125 | ÷ | 3 | = | v | × | 2 3 | v | v | + | 1 | × | 50 3 | ÷ | 1 | × | v | − | 2 | v | v | − | 5 4 |
| 18 | v | − | 2 9 | v | v | v | − | 125 9 | v | ÷ | v | × | v | + | 5 3 | v | = | v | × | 2 3 | v | v | + | 50 3 | v | − | 2 | v | v | − | 5 6 | v | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 18 | v | − | 2 9 | v | v | v | − | 125 9 | × | 1 | ÷ | 1 | × | v | + | 5 3 | v | = | v | × | 2 3 | v | v | + | 50 3 | v | − | 2 | v | v | − | 5 6 | v | ( | 2 | v | ÷ | 3 | + | 50 | ÷ | 3 | ÷ | v | − | 2 | ) |
| 18 | v | − | 2 9 | v | v | v | − | 125 9 | × | 1 | ÷ | 1 | × | v | + | 5 3 | v | = | v | × | 2 3 | v | v | + | 50 3 | v | − | 2 | v | v | − | 5 6 | v | × | 2 |
| 18 | v | − | 2 9 | v | v | v | − | 125 9 | v | + | 5 3 | v | v | − | 125 9 | = | v | × | 2 3 | v | v | + | 50 3 | v | − | 2 | v | v | − | 5 9 | v | v |
| - | 88 9 | v | − | 2 9 | v | v | v | + | 5 3 | v | v | − | 15625 18 | ÷ | v | + | 625 6 | = | v | × | 2 3 | v | v | + | 50 3 | v | − | 2 | v | v | − | 5 9 | v | v |
| 方程两边同时乘以: | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |
| - | 88 9 | v | v | − | 2 9 | v | v | v | v | + | 5 3 | v | v | v | = | v | × | 2 3 | v | v | v | + | 50 3 | v | v | − | 2 | v | v | v |