| ( | 4831 2 | − | y | ) | ÷ | y | = | 3 100 |
| 方程两边同时乘以: | y |
| ( | 4831 2 | − | y | ) | = | 3 100 | y |
4831 2 | − | y | = | 3 100 | y |
| - | y | − | 3 100 | y | = | - | 4831 2 |
| - | 103 100 | y | = | - | 4831 2 |
4831 2 | = | 103 100 | y |
103 100 | y | = | 4831 2 |
| y | = | 4831 2 | ÷ | 103 100 |
| = | 4831 2 | × | 100 103 |
| = | 4831 | × | 50 103 |
| y | = | 241550 103 |
| y | = | 2345.145631 |