( | 400 | − | 150 | ) | − | x | ( | 1 | − | 25 100 | ) | = | 100 |
方程左边 = | 400 | − | 150 | − | x | ( | 1 | − | 25 100 | ) |
= | 250 | − | x | ( | 1 | − | 25 100 | ) |
= | 250 | − | x | × | 1 | + | x | × | 25 100 |
= | 250 | − | 3 4 | x |
250 | − | 3 4 | x | = | 100 |
- | 3 4 | x | = | 100 | − | 250 |
- | 3 4 | x | = | - | 150 |
150 | = | 3 4 | x |
3 4 | x | = | 150 |
x | = | 150 | ÷ | 3 4 |
= | 150 | × | 4 3 |
= | 50 | × | 4 |
x | = | 200 |