( | 300 | − | 33 2 | x | ) | ( | x | + | 30 | ) | = | ( | 50 | − | x | ) | ( | 33 2 | x | − | 180 | ) |
方程左边 = | 300 | ( | x | + | 30 | ) | − | 33 2 | x | ( | x | + | 30 | ) |
= | 300 | x | + | 300 | × | 30 | − | 33 2 | x | ( | x | + | 30 | ) |
= | 300 | x | + | 9000 | − | 33 2 | x | ( | x | + | 30 | ) |
= | 300 | x | + | 9000 | − | 33 2 | x | x | − | 33 2 | x | × | 30 |
= | 300 | x | + | 9000 | − | 33 2 | x | x | − | 495 | x |
= | - | 195 | x | + | 9000 | − | 33 2 | x | x |
- | 195 | x | + | 9000 | − | 33 2 | x | x | = | ( | 50 | − | x | ) | ( | 33 2 | x | − | 180 | ) |
方程右边 = | 50 | ( | 33 2 | x | − | 180 | ) | − | x | ( | 33 2 | x | − | 180 | ) |
= | 50 | × | 33 2 | x | − | 50 | × | 180 | − | x | ( | 33 2 | x | − | 180 | ) |
= | 825 | x | − | 9000 | − | x | ( | 33 2 | x | − | 180 | ) |
= | 825 | x | − | 9000 | − | x | × | 33 2 | x | + | x | × | 180 |
= | 1005 | x | − | 9000 | − | x | × | 33 2 | x |
- | 195 | x | + | 9000 | − | 33 2 | x | x | = | 1005 | x | − | 9000 | − | x | × | 33 2 | x |