| ( | 100 | − | 97 | ) | ÷ | ( | 100 | − | 2307 25 | ) | = | ( | r | − | 4 100 | ) | ÷ | ( | 5 100 | − | 4 100 | ) |
| 方程两边同时乘以: | ( | 100 | − | 2307 25 | ) | , | ( | 5 100 | − | 4 100 | ) |
| ( | 100 | − | 97 | ) | ( | 5 100 | − | 4 100 | ) | = | ( | r | − | 4 100 | ) | ( | 100 | − | 2307 25 | ) |
| 100 | ( | 5 100 | − | 4 100 | ) | − | 97 | ( | 5 100 | − | 4 100 | ) | = | ( | r | − | 4 100 | ) | ( | 100 | − | 2307 25 | ) |
| 100 | ( | 5 100 | − | 4 100 | ) | − | 97 | ( | 5 100 | − | 4 100 | ) | = | r | ( | 100 | − | 2307 25 | ) | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 100 | × | 5 100 | − | 100 | × | 4 100 | − | 97 | ( | 5 100 | − | 4 100 | ) | = | r | ( | 100 | − | 2307 25 | ) | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 100 | × | 5 100 | − | 100 | × | 4 100 | − | 97 | ( | 5 100 | − | 4 100 | ) | = | r | × | 100 | − | r | × | 2307 25 | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 5 | − | 4 | − | 97 | ( | 5 100 | − | 4 100 | ) | = | r | × | 100 | − | r | × | 2307 25 | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 1 | − | 97 | ( | 5 100 | − | 4 100 | ) | = | 193 25 | r | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 1 | − | 97 | × | 5 100 | + | 97 | × | 4 100 | = | 193 25 | r | − | 4 100 | ( | 100 | − | 2307 25 | ) |
| 1 | − | 97 | × | 5 100 | + | 97 | × | 4 100 | = | 193 25 | r | − | 4 100 | × | 100 | + | 4 100 | × | 2307 25 |
| 1 | − | 97 20 | + | 97 25 | = | 193 25 | r | − | 4 | + | 2307 625 |
3 100 | = | 193 25 | r | − | 193 625 |
| - | 193 25 | r | = | - | 193 625 | − | 3 100 |
| - | 193 25 | r | = | - | 847 2500 |
847 2500 | = | 193 25 | r |
193 25 | r | = | 847 2500 |
| r | = | 847 2500 | ÷ | 193 25 |
| = | 847 2500 | × | 25 193 |
| = | 847 100 | × | 1 193 |
| r | = | 847 19300 |
| r | = | 0.043886 |