5 | x | ( | ( | 3 2 | x | − | 30 | ) | x | × | 4 5 | − | x | ) | = | ( | 3 2 | x | − | x | ) | + | 130 |
方程左边 = | 5 | x | ( | 3 2 | x | − | 30 | ) | x | × | 4 5 | − | 5 | x | x |
= | 4 | x | ( | 3 2 | x | − | 30 | ) | x | − | 5 | x | x |
= | 4 | x | × | 3 2 | x | x | − | 4 | x | × | 30 | x | − | 5 | x | x |
= | 6 | x | x | x | − | 120 | x | x | − | 5 | x | x |
6 | x | x | x | − | 120 | x | x | − | 5 | x | x | = | ( | 3 2 | x | − | x | ) | + | 130 |
方程右边 = | 3 2 | x | − | x | + | 130 |
= | 1 2 | x | + | 130 |
6 | x | x | x | − | 120 | x | x | − | 5 | x | x | = | 1 2 | x | + | 130 |