| 10000 | ( | x | − | 50 | ) | ( | - | 1 20 | x | + | 11 2 | ) | − | 60 | × | 2500 | − | 100000 | = | 0 |
| 方程左边 = | 10000 | ( | x | − | 50 | ) | ( | - | 1 20 | x | + | 11 2 | ) | − | 150000 | − | 100000 |
| = | 10000 | ( | x | − | 50 | ) | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 |
| 10000 | ( | x | − | 50 | ) | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 | = | 0 |
| 方程左边 = | 10000 | x | ( | - | 1 20 | x | + | 11 2 | ) | − | 10000 | × | 50 | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 |
| = | 10000 | x | ( | - | 1 20 | x | + | 11 2 | ) | − | 500000 | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 |
| = | - | 10000 | x | × | 1 20 | x | + | 10000 | x | × | 11 2 | − | 500000 | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 |
| = | - | 500 | x | x | + | 55000 | x | − | 500000 | ( | - | 1 20 | x | + | 11 2 | ) | − | 250000 |
| = | - | 500 | x | x | + | 55000 | x | + | 500000 | × | 1 20 | x | − | 500000 | × | 11 2 | − | 250000 |
| = | - | 500 | x | x | + | 55000 | x | + | 25000 | x | − | 2750000 | − | 250000 |
| = | - | 500 | x | x | + | 80000 | x | − | 3000000 |
| - | 500 | x | x | + | 80000 | x | − | 3000000 | = | 0 |