5 | ( | x | − | 1 | ) | ( | x | − | 1 | ) | + | 5 | − | 5 | ( | x | − | 1 4 | ) | = | 5 4 |
方程左边 = | 5 | x | ( | x | − | 1 | ) | − | 5 | × | 1 | ( | x | − | 1 | ) | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | ( | x | − | 1 | ) | − | 5 | ( | x | − | 1 | ) | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 5 | x | × | 1 | − | 5 | ( | x | − | 1 | ) | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 5 | x | − | 5 | ( | x | − | 1 | ) | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 5 | x | − | 5 | x | + | 5 | × | 1 | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 5 | x | − | 5 | x | + | 5 | + | 5 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 10 | x | + | 10 | − | 5 | ( | x | − | 1 4 | ) |
= | 5 | x | x | − | 10 | x | + | 10 | − | 5 | x | + | 5 | × | 1 4 |
= | 5 | x | x | − | 10 | x | + | 10 | − | 5 | x | + | 5 4 |
= | 5 | x | x | − | 15 | x | + | 45 4 |
5 | x | x | − | 15 | x | + | 45 4 | = | 5 4 |