4 100 | ÷ | 4 | = | 1107 5000 | A | + | ( | - | 1813 10000 | ) | ( | 1 | − | A | ) |
| 方程左边 = | 1 100 |
1 100 | = | 1107 5000 | A | + | ( | - | 1813 10000 | ) | ( | 1 | − | A | ) |
| 方程右边 = | 1107 5000 | A | − | 1813 10000 | ( | 1 | − | A | ) |
| = | 1107 5000 | A | − | 1813 10000 | × | 1 | + | 1813 10000 | A |
| = | 1107 5000 | A | − | 1813 10000 | + | 1813 10000 | A |
| = | 4027 10000 | A | − | 1813 10000 |
1 100 | = | 4027 10000 | A | − | 1813 10000 |
| - | 4027 10000 | A | = | - | 1813 10000 | − | 1 100 |
| - | 4027 10000 | A | = | - | 1913 10000 |
1913 10000 | = | 4027 10000 | A |
4027 10000 | A | = | 1913 10000 |
| A | = | 1913 10000 | ÷ | 4027 10000 |
| = | 1913 10000 | × | 10000 4027 |
| = | 1913 | × | 1 4027 |
| A | = | 1913 4027 |
| A | = | 0.475043 |