| ( | 1 1000 | − | x | ) | × | 2000 | ÷ | 1 100 | = | ( | 1 500 | + | x | ) | × | 1000 | ÷ | 1 50 |
| 方程左边 = | ( | 1 1000 | − | x | ) | × | 200000 |
| ( | 1 1000 | − | x | ) | × | 200000 | = | ( | 1 500 | + | x | ) | × | 1000 | ÷ | 1 50 |
| 方程左边 = | 1 1000 | × | 200000 | − | x | × | 200000 |
| = | 200 | − | x | × | 200000 |
| 200 | − | 200000 | x | = | ( | 1 500 | + | x | ) | × | 1000 | ÷ | 1 50 |
| 方程右边 = | ( | 1 500 | + | x | ) | × | 50000 |
| 200 | − | 200000 | x | = | ( | 1 500 | + | x | ) | × | 50000 |
| 方程右边 = | 1 500 | × | 50000 | + | x | × | 50000 |
| = | 100 | + | x | × | 50000 |
| 200 | − | 200000 | x | = | 100 | + | 50000 | x |
| - | 200000 | x | − | 50000 | x | = | 100 | − | 200 |
| - | 250000 | x | = | 100 | − | 200 |
| - | 250000 | x | = | - | 100 |
| 100 | = | 250000 | x |
| 250000 | x | = | 100 |
| x | = | 100 | ÷ | 250000 |
| = | 100 | × | 1 250000 |
| = | 1 | × | 1 2500 |
| x | = | 1 2500 |
| x | = | 0.0004 |