( | x | − | 2 | ) | ( | x | − | 2 | ) | − | 4 | × | 4 | ( | x | − | 5 | ) | = | 0 |
方程左边 = | ( | x | − | 2 | ) | ( | x | − | 2 | ) | − | 16 | ( | x | − | 5 | ) |
( | x | − | 2 | ) | ( | x | − | 2 | ) | − | 16 | ( | x | − | 5 | ) | = | 0 |
方程左边 = | x | ( | x | − | 2 | ) | − | 2 | ( | x | − | 2 | ) | − | 16 | ( | x | − | 5 | ) |
= | x | x | − | x | × | 2 | − | 2 | ( | x | − | 2 | ) | − | 16 | ( | x | − | 5 | ) |
= | x | x | − | 2 | x | − | 2 | x | + | 2 | × | 2 | − | 16 | ( | x | − | 5 | ) |
= | x | x | − | 2 | x | − | 2 | x | + | 4 | − | 16 | ( | x | − | 5 | ) |
= | x | x | − | 4 | x | + | 4 | − | 16 | ( | x | − | 5 | ) |
= | x | x | − | 4 | x | + | 4 | − | 16 | x | + | 16 | × | 5 |
= | x | x | − | 4 | x | + | 4 | − | 16 | x | + | 80 |
= | x | x | − | 20 | x | + | 84 |
x | x | − | 20 | x | + | 84 | = | 0 |