36 | + | ( | 16 | − | 5 | x | ) | ( | 16 | − | 5 | x | ) | = | 100 |
方程左边 = | 36 | + | 16 | ( | 16 | − | 5 | x | ) | − | 5 | x | ( | 16 | − | 5 | x | ) |
= | 36 | + | 16 | × | 16 | − | 16 | × | 5 | x | − | 5 | x | ( | 16 | − | 5 | x | ) |
= | 36 | + | 256 | − | 80 | x | − | 5 | x | ( | 16 | − | 5 | x | ) |
= | 292 | − | 80 | x | − | 5 | x | ( | 16 | − | 5 | x | ) |
= | 292 | − | 80 | x | − | 5 | x | × | 16 | + | 5 | x | × | 5 | x |
= | 292 | − | 80 | x | − | 80 | x | + | 25 | x | x |
= | 292 | − | 160 | x | + | 25 | x | x |
292 | − | 160 | x | + | 25 | x | x | = | 100 |
x1= | 8 5 |
x2= | 24 5 |