| 20 | ÷ | 4457 50 | + | 3 | ÷ | 45 | + | 5 | ÷ | 447 10 | + | X | ÷ | 1000 | + | ( | 119 2 | − | X | ) | ÷ | 1650 | = | 54 125 |
| 方程左边 = | 1000 4457 | + | 1 15 | + | 50 447 | + | X | × | 1 1000 | + | ( | 119 2 | − | X | ) | × | 1 1650 |
| = | 1337781 3320465 | + | 1 1000 | X | + | ( | 119 2 | − | X | ) | × | 1 1650 |
1337781 3320465 | + | 1 1000 | X | + | ( | 119 2 | − | X | ) | × | 1 1650 | = | 54 125 |
| 方程左边 = | 1337781 3320465 | + | 1 1000 | X | + | 119 2 | × | 1 1650 | − | X | × | 1 1650 |
| = | 1337781 3320465 | + | 1 1000 | X | + | 119 3300 | − | X | × | 1 1650 |
| X= | - | √6225489 √20000 |