| ( | 33 | r | + | 1 | ) | × | 1 100 | × | 32 | = | 0 |
| 方程左边 = | ( | 33 | r | + | 1 | ) | × | 8 25 |
| ( | 33 | r | + | 1 | ) | × | 8 25 | = | 0 |
| 方程左边 = | 33 | r | × | 8 25 | + | 1 | × | 8 25 |
| = | 264 25 | r | + | 8 25 |
264 25 | r | + | 8 25 | = | 0 |
264 25 | r | = | 0 | − | 8 25 |
264 25 | r | = | - | 8 25 |
| r | = | - | 8 25 | ÷ | 264 25 |
| = | - | 8 25 | × | 25 264 |
| = | - | 1 | × | 1 33 |
| r | = | - | 1 33 |
| r | = | - 0.030303 |