( | 2 | − | 2 | x | ) | ( | 6 5 | − | 2 | x | ) | = | 32 25 |
方程左边 = | 2 | ( | 6 5 | − | 2 | x | ) | − | 2 | x | ( | 6 5 | − | 2 | x | ) |
= | 2 | × | 6 5 | − | 2 | × | 2 | x | − | 2 | x | ( | 6 5 | − | 2 | x | ) |
= | 12 5 | − | 4 | x | − | 2 | x | ( | 6 5 | − | 2 | x | ) |
= | 12 5 | − | 4 | x | − | 2 | x | × | 6 5 | + | 2 | x | × | 2 | x |
= | 12 5 | − | 4 | x | − | 12 5 | x | + | 4 | x | x |
= | 12 5 | − | 32 5 | x | + | 4 | x | x |
12 5 | − | 32 5 | x | + | 4 | x | x | = | 32 25 |
x1= | 1 5 |
x2= | 7 5 |