600 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | = | 384 |
方程左边 = | 600 | × | 1 | ( | 1 | − | x | ) | − | 600 | x | ( | 1 | − | x | ) |
= | 600 | ( | 1 | − | x | ) | − | 600 | x | ( | 1 | − | x | ) |
= | 600 | × | 1 | − | 600 | x | − | 600 | x | ( | 1 | − | x | ) |
= | 600 | − | 600 | x | − | 600 | x | ( | 1 | − | x | ) |
= | 600 | − | 600 | x | − | 600 | x | × | 1 | + | 600 | x | x |
= | 600 | − | 600 | x | − | 600 | x | + | 600 | x | x |
= | 600 | − | 1200 | x | + | 600 | x | x |
600 | − | 1200 | x | + | 600 | x | x | = | 384 |
x1= | 1 5 |
x2= | 9 5 |