| - | 8 | − | 3 | x | ( | 3 | − | 3 4 | x | ) | × | 1 2 | + | 8 | ( | 3 | − | 3 4 | x | ) | × | 1 2 | + | 2 | x | = | 0 |
| 方程左边 = | - | 8 | − | 3 2 | x | ( | 3 | − | 3 4 | x | ) | + | 4 | ( | 3 | − | 3 4 | x | ) | + | 2 | x |
| - | 8 | − | 3 2 | x | ( | 3 | − | 3 4 | x | ) | + | 4 | ( | 3 | − | 3 4 | x | ) | + | 2 | x | = | 0 |
| 方程左边 = | - | 8 | − | 3 2 | x | × | 3 | + | 3 2 | x | × | 3 4 | x | + | 4 | ( | 3 | − | 3 4 | x | ) | + | 2 | x |
| = | - | 8 | − | 9 2 | x | + | 9 8 | x | x | + | 4 | ( | 3 | − | 3 4 | x | ) | + | 2 | x |
| = | - | 8 | − | 5 2 | x | + | 9 8 | x | x | + | 4 | ( | 3 | − | 3 4 | x | ) |
| = | - | 8 | − | 5 2 | x | + | 9 8 | x | x | + | 4 | × | 3 | − | 4 | × | 3 4 | x |
| = | - | 8 | − | 5 2 | x | + | 9 8 | x | x | + | 12 | − | 3 | x |
| = | 4 | − | 11 2 | x | + | 9 8 | x | x |
| 4 | − | 11 2 | x | + | 9 8 | x | x | = | 0 |
| x1= | 8 9 |
| x2=4 |