3 | x | ( | x | − | 1 | ) | ( | x | − | 2 | ) | = | 0 |
方程左边 = | 3 | x | x | ( | x | − | 2 | ) | − | 3 | x | × | 1 | ( | x | − | 2 | ) |
= | 3 | x | x | ( | x | − | 2 | ) | − | 3 | x | ( | x | − | 2 | ) |
= | 3 | x | x | x | − | 3 | x | x | × | 2 | − | 3 | x | ( | x | − | 2 | ) |
= | 3 | x | x | x | − | 6 | x | x | − | 3 | x | ( | x | − | 2 | ) |
= | 3 | x | x | x | − | 6 | x | x | − | 3 | x | x | + | 3 | x |
= | 3 | x | x | x | − | 6 | x | x | − | 3 | x | x | + | 6 | x |
3 | x | x | x | − | 6 | x | x | − | 3 | x | x | + | 6 | x | = | 0 |