| ( | 100 | − | x | ) | ( | 95 | − | x | ) | × | 100 | = | 0 |
| 方程左边 = | 100 | ( | 95 | − | x | ) | × | 100 | − | x | ( | 95 | − | x | ) | × | 100 |
| = | 10000 | ( | 95 | − | x | ) | − | x | ( | 95 | − | x | ) | × | 100 |
| = | 10000 | × | 95 | − | 10000 | x | − | x | ( | 95 | − | x | ) | × | 100 |
| = | 950000 | − | 10000 | x | − | x | ( | 95 | − | x | ) | × | 100 |
| = | 950000 | − | 10000 | x | − | x | × | 95 | × | 100 | + | x | x | × | 100 |
| = | 950000 | − | 10000 | x | − | x | × | 9500 | + | x | x | × | 100 |
| = | 950000 | − | 19500 | x | + | x | x | × | 100 |
| 950000 | − | 19500 | x | + | x | x | × | 100 | = | 0 |