| ( | 501 500 | − | 1 5000 | ) | x | + | ( | 499 500 | − | 1 5000 | ) | ( | 1 | − | x | ) | = | 1 |
| 方程左边 = | 501 500 | x | − | 1 5000 | x | + | ( | 499 500 | − | 1 5000 | ) | ( | 1 | − | x | ) |
| = | 5009 5000 | x | + | ( | 499 500 | − | 1 5000 | ) | ( | 1 | − | x | ) |
| = | 5009 5000 | x | + | 499 500 | ( | 1 | − | x | ) | − | 1 5000 | ( | 1 | − | x | ) |
| = | 5009 5000 | x | + | 499 500 | × | 1 | − | 499 500 | x | − | 1 5000 | ( | 1 | − | x | ) |
| = | 5009 5000 | x | + | 499 500 | − | 499 500 | x | − | 1 5000 | ( | 1 | − | x | ) |
| = | 19 5000 | x | + | 499 500 | − | 1 5000 | ( | 1 | − | x | ) |
| = | 19 5000 | x | + | 499 500 | − | 1 5000 | × | 1 | + | 1 5000 | x |
| = | 19 5000 | x | + | 499 500 | − | 1 5000 | + | 1 5000 | x |
| = | 1 250 | x | + | 4989 5000 |
1 250 | x | + | 4989 5000 | = | 1 |
1 250 | x | = | 1 | − | 4989 5000 |
1 250 | x | = | 11 5000 |
| x | = | 11 5000 | ÷ | 1 250 |
| = | 11 5000 | × | 250 |
| = | 11 20 | × | 1 |
| x | = | 11 20 |
| x | = | 0.55 |