191 4 | ( | 2387 100 | x | x | + | 477 10 | ) | + | ( | 191 4 | x | − | 15 | ) | × | 2 | × | 2387 100 | x | = | 0 |
| 方程左边 = | 191 4 | ( | 2387 100 | x | x | + | 477 10 | ) | + | ( | 191 4 | x | − | 15 | ) | × | 2387 50 | x |
191 4 | ( | 2387 100 | x | x | + | 477 10 | ) | + | ( | 191 4 | x | − | 15 | ) | × | 2387 50 | x | = | 0 |
| 方程左边 = | 191 4 | × | 2387 100 | x | x | + | 191 4 | × | 477 10 | + | ( | 191 4 | x | − | 15 | ) | × | 2387 50 | x |
| = | 455917 400 | x | x | + | 91107 40 | + | ( | 191 4 | x | − | 15 | ) | × | 2387 50 | x |
| = | 455917 400 | x | x | + | 91107 40 | + | 191 4 | x | × | 2387 50 | x | − | 15 | × | 2387 50 | x |
| = | 455917 400 | x | x | + | 91107 40 | + | 455917 200 | x | x | − | 7161 10 | x |
455917 400 | x | x | + | 91107 40 | + | 455917 200 | x | x | − | 7161 10 | x | = | 0 |