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