| ( | 1 100 | + | 1 100 | + | 1078 | x | ) | × | 1079 | ÷ | 2 | = | 30000 |
| 方程左边 = | ( | 1 100 | + | 1 100 | + | 1078 | x | ) | × | 1079 2 |
| ( | 1 100 | + | 1 100 | + | 1078 | x | ) | × | 1079 2 | = | 30000 |
| 方程左边 = | 1 100 | × | 1079 2 | + | 1 100 | × | 1079 2 | + | 1078 | x | × | 1079 2 |
| = | 1079 200 | + | 1079 200 | + | 581581 | x |
| = | 1079 100 | + | 581581 | x |
1079 100 | + | 581581 | x | = | 30000 |
| 581581 | x | = | 30000 | − | 1079 100 |
| 581581 | x | = | 2998921 100 |
| x | = | 2998921 100 | ÷ | 581581 |
| = | 2998921 100 | × | 1 581581 |
| x | = | 2998921 58158100 |
| x | = | 0.051565 |