| ( | 10 | − | 450 | l | ) | ÷ | ( | 1 10 | − | l | ) | × | 1 10 | = | 500 |
| 方程两边同时乘以: | ( | 1 10 | − | l | ) |
| ( | 10 | − | 450 | l | ) | × | 1 10 | = | 500 | ( | 1 10 | − | l | ) |
| 10 | × | 1 10 | − | 450 | l | × | 1 10 | = | 500 | ( | 1 10 | − | l | ) |
| 10 | × | 1 10 | − | 450 | l | × | 1 10 | = | 500 | × | 1 10 | − | 500 | l |
| 1 | − | 45 | l | = | 50 | − | 500 | l |
| - | 45 | l | + | 500 | l | = | 50 | − | 1 |
| 455 | l | = | 50 | − | 1 |
| 455 | l | = | 49 |
| l | = | 49 | ÷ | 455 |
| = | 49 | × | 1 455 |
| = | 7 | × | 1 65 |
| l | = | 7 65 |
| l | = | 0.107692 |