1787 100 | × | 1000000 | = | 191 10 | × | 200 | x | ( | 310 | − | x | ÷ | 2 | ) |
| 方程左边 = | 17870000 |
| 17870000 | = | 191 10 | × | 200 | x | ( | 310 | − | x | ÷ | 2 | ) |
| 方程右边 = | 3820 | x | ( | 310 | − | x | ÷ | 2 | ) |
| 17870000 | = | 3820 | x | ( | 310 | − | x | ÷ | 2 | ) |
| 方程右边 = | 3820 | x | × | 310 | − | 3820 | x | x | ÷ | 2 |
| = | 1184200 | x | − | 1910 | x | x |
| 17870000 | = | 1184200 | x | − | 1910 | x | x |