( | x | − | 180 | ) | ÷ | 2400 | = | ( | x | − | 450 | ) | ÷ | 2000 |
方程左边 = | x | × | 1 2400 | − | 180 | × | 1 2400 |
= | x | × | 1 2400 | − | 3 40 |
1 2400 | x | − | 3 40 | = | ( | x | − | 450 | ) | ÷ | 2000 |
方程右边 = | x | × | 1 2000 | − | 450 | × | 1 2000 |
= | x | × | 1 2000 | − | 9 40 |
1 2400 | x | − | 3 40 | = | 1 2000 | x | − | 9 40 |
1 2400 | x | − | 1 2000 | x | = | - | 9 40 | + | 3 40 |
- | 1 12000 | x | = | - | 9 40 | + | 3 40 |
- | 1 12000 | x | = | - | 3 20 |
3 20 | = | 1 12000 | x |
1 12000 | x | = | 3 20 |
x | = | 3 20 | ÷ | 1 12000 |
= | 3 20 | × | 12000 |
= | 3 | × | 600 |
x | = | 1800 |