( | x | − | 50 | ) | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) | = | 0 |
方程左边 = | x | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) | − | 50 | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) |
= | x | × | 50 | + | x | × | 5 | ( | 100 | − | x | ) | − | 50 | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) |
= | 50 | x | + | x | × | 5 | × | 100 | − | x | × | 5 | x | − | 50 | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) |
= | 50 | x | + | x | × | 500 | − | x | × | 5 | x | − | 50 | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) |
= | 550 | x | − | x | × | 5 | x | − | 50 | ( | 50 | + | 5 | ( | 100 | − | x | ) | ) |
= | 550 | x | − | x | × | 5 | x | − | 50 | × | 50 | − | 50 | × | 5 | ( | 100 | − | x | ) |
= | 550 | x | − | x | × | 5 | x | − | 2500 | − | 250 | ( | 100 | − | x | ) |
= | 550 | x | − | x | × | 5 | x | − | 2500 | − | 250 | × | 100 | + | 250 | x |
= | 550 | x | − | x | × | 5 | x | − | 2500 | − | 25000 | + | 250 | x |
= | 800 | x | − | x | × | 5 | x | − | 27500 |
800 | x | − | x | × | 5 | x | − | 27500 | = | 0 |