( | x | − | 20 | ) | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) | = | 9450 |
方程左边 = | x | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) | − | 20 | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) |
= | x | × | 50 | − | x | ( | x | − | 180 | ) | ÷ | 10 | − | 20 | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) |
= | 50 | x | − | x | x | × | 1 10 | + | x | × | 180 | × | 1 10 | − | 20 | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) |
= | 50 | x | − | x | x | × | 1 10 | + | x | × | 18 | − | 20 | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) |
= | 68 | x | − | x | x | × | 1 10 | − | 20 | ( | 50 | − | ( | x | − | 180 | ) | ÷ | 10 | ) |
= | 68 | x | − | x | x | × | 1 10 | − | 20 | × | 50 | + | 20 | ( | x | − | 180 | ) | ÷ | 10 |
= | 68 | x | − | x | x | × | 1 10 | − | 1000 | + | 2 | ( | x | − | 180 | ) |
= | 68 | x | − | x | x | × | 1 10 | − | 1000 | + | 2 | x | − | 2 | × | 180 |
= | 68 | x | − | x | x | × | 1 10 | − | 1000 | + | 2 | x | − | 360 |
= | 70 | x | − | x | x | × | 1 10 | − | 1360 |
70 | x | − | x | x | × | 1 10 | − | 1360 | = | 9450 |