( | 2000 | ( | 1 | − | x | ) | − | 1000 | ) | ( | 1 | + | x | ) | = | 22149 20 |
方程左边 = | 2000 | ( | 1 | − | x | ) | ( | 1 | + | x | ) | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | × | 1 | ( | 1 | + | x | ) | − | 2000 | x | ( | 1 | + | x | ) | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | ( | 1 | + | x | ) | − | 2000 | x | ( | 1 | + | x | ) | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | × | 1 | + | 2000 | x | − | 2000 | x | ( | 1 | + | x | ) | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | + | 2000 | x | − | 2000 | x | ( | 1 | + | x | ) | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | + | 2000 | x | − | 2000 | x | × | 1 | − | 2000 | x | x | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | + | 2000 | x | − | 2000 | x | − | 2000 | x | x | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | + | 0 | x | − | 2000 | x | x | − | 1000 | ( | 1 | + | x | ) |
= | 2000 | − | 2000 | x | x | − | 1000 | × | 1 | − | 1000 | x |
= | 2000 | − | 2000 | x | x | − | 1000 | − | 1000 | x |
= | 1000 | − | 2000 | x | x | − | 1000 | x |
1000 | − | 2000 | x | x | − | 1000 | x | = | 22149 20 |