| x | = | 400 | ( | 3 | − | 1 100 | ( | 1 | + | 24 25 | ) | ) | × | 1 5 | ÷ | 24 25 |
| 方程右边 = | 250 3 | ( | 3 | − | 1 100 | ( | 1 | + | 24 25 | ) | ) |
| x | = | 250 3 | ( | 3 | − | 1 100 | ( | 1 | + | 24 25 | ) | ) |
| 方程右边 = | 250 3 | × | 3 | − | 250 3 | × | 1 100 | ( | 1 | + | 24 25 | ) |
| = | 250 | − | 5 6 | ( | 1 | + | 24 25 | ) |
| = | 250 | − | 5 6 | × | 1 | − | 5 6 | × | 24 25 |
| = | 250 | − | 5 6 | − | 4 5 |
| = | 7451 30 |
| x | = | 7451 30 |