( | 2 | − | x | ) | ( | 1 | − | x | ) | ( | - | x | ) | + | 8 | x | − | 8 | = | 0 |
方程左边 = | 2 | ( | 1 | − | x | ) | ( | - | x | ) | − | x | ( | 1 | − | x | ) | ( | - | x | ) | + | 8 | x | − | 8 |
= | 2 | × | 1 | ( | - | x | ) | − | 2 | x | ( | - | x | ) | − | x | ( | 1 | − | x | ) | ( | - | x | ) | + | 8 | x | − | 8 |
= | 2 | ( | - | x | ) | − | 2 | x | ( | - | x | ) | − | x | ( | 1 | − | x | ) | ( | - | x | ) | + | 8 | x | − | 8 |
= | - | 2 | x | − | 2 | x | ( | - | x | ) | − | x | ( | 1 | − | x | ) | ( | - | x | ) | + | 8 | x | − | 8 |
= | 6 | x | − | 2 | x | ( | - | x | ) | − | x | ( | 1 | − | x | ) | ( | - | x | ) | − | 8 |
= | 6 | x | + | 2 | x | x | − | x | ( | 1 | − | x | ) | ( | - | x | ) | − | 8 |
= | 6 | x | + | 2 | x | x | − | x | × | 1 | ( | - | x | ) | + | x | x | ( | - | x | ) | − | 8 |
= | 6 | x | + | 2 | x | x | + | x | × | 1 | x | + | x | x | ( | - | x | ) | − | 8 |
= | 6 | x | + | 2 | x | x | + | x | × | 1 | x | − | x | x | x | − | 8 |
6 | x | + | 2 | x | x | + | x | × | 1 | x | − | x | x | x | − | 8 | = | 0 |