( | 60 | − | 2 | x | ) | ( | 22 | − | 2 | x | ) | = | 0 |
方程左边 = | 60 | ( | 22 | − | 2 | x | ) | − | 2 | x | ( | 22 | − | 2 | x | ) |
= | 60 | × | 22 | − | 60 | × | 2 | x | − | 2 | x | ( | 22 | − | 2 | x | ) |
= | 1320 | − | 120 | x | − | 2 | x | ( | 22 | − | 2 | x | ) |
= | 1320 | − | 120 | x | − | 2 | x | × | 22 | + | 2 | x | × | 2 | x |
= | 1320 | − | 120 | x | − | 44 | x | + | 4 | x | x |
= | 1320 | − | 164 | x | + | 4 | x | x |
1320 | − | 164 | x | + | 4 | x | x | = | 0 |