| ( | 500 | − | 4 | x | ) | × | 1000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) | = | 618000 |
| 方程左边 = | ( | 500 | − | 4 | x | ) | × | 1000000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) |
| ( | 500 | − | 4 | x | ) | × | 1000000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | = | 618000 |
| 方程左边 = | 500 | × | 1000000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | − | 4 | x | × | 1000000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) |
| = | 500000000 | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | − | 4000000 | x | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) |
| = | 500000000 | × | 1 | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | + | 500000000 | × | x% | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | − | 4000000 | x | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) |
| = | 500000000 | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | + | 5000000 | x | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | − | 4000000 | x | ( | 1 | + | x% | ) | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) |
| = | 500000000 | × | 100 | ( | 1 | + | x% | ) | − | 500000000 | × | 3 2 | x | ( | 1 | + | x% | ) | + | 5000000 | x | ( | 100 | − | 3 2 | x | ) | ( | 1 | + | x% | ) | − | 4000000 |