| ( | 500 | − | 4 | x | ) | × | 1000 | ( | 1 | + | x% | ) | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) | = | 618000 |
| 方程左边 = | 500 | × | 1000 | ( | 1 | + | x% | ) | − | 4 | x | × | 1000 | ( | 1 | + | x% | ) | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | ( | 1 | + | x% | ) | − | 4000 | x | ( | 1 | + | x% | ) | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | × | 1 | + | 500000 | × | x% | − | 4000 | x | ( | 1 | + | x% | ) | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | + | 5000 | x | − | 4000 | x | ( | 1 | + | x% | ) | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | + | 5000 | x | − | 4000 | x | × | 1 | − | 4000 | x | × | x% | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | + | 5000 | x | − | 4000 | x | − | 40 | x | x | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | + | 1000 | x | − | 40 | x | x | + | ( | 100 | − | 3 2 | x | ) | × | 1000 | ( | 1 | + | x% | ) |
| = | 500000 | + | 1000 | x | − | 40 | x | x | + | 100 | × | 1000 | ( | 1 | + | x% | ) | − | 3 2 | x | × | 1000 |
| = | 500000 | + | 1000 | x | − | 40 | x | x | + | 100000 | ( | 1 | + | x% | ) | − | 1500 | x | ( | 1 | + | x% | ) |
| = | 500000 | + | 1000 | x | − | 40 | x | x | + | 100000 | × | 1 | + | 100000 | × | x% | − | 1500 | x |
| = | 500000 | + | 1000 | x | − | 40 | x | x | + | 100000 | + | 1000 | x | − | 1500 | x | ( | 1 | + | x% | ) |
| = | 600000 | + | 2000 | x | − | 40 | x | x | − | 1500 | x | ( | 1 | + | x% | ) |
| = | 600000 | + | 2000 | x | − | 40 | x | x | − | 1500 | x | × | 1 | − | 1500 | x | × | x% |
| = | 600000 | + | 2000 | x | − | 40 | x | x | − | 1500 | x | − | 15 | x | x |
| = | 600000 | + | 500 | x | − | 40 | x | x | − | 15 | x | x |
| 600000 | + | 500 | x | − | 40 | x | x | − | 15 | x | x | = | 618000 |