( | 4 | × | 20000 | + | 2 | x | ) | ÷ | ( | 20000 | + | x | ) | = | 3 |
方程两边同时乘以: | ( | 20000 | + | x | ) |
( | 4 | × | 20000 | + | 2 | x | ) | = | 3 | ( | 20000 | + | x | ) |
4 | × | 20000 | + | 2 | x | = | 3 | ( | 20000 | + | x | ) |
4 | × | 20000 | + | 2 | x | = | 3 | × | 20000 | + | 3 | x |
80000 | + | 2 | x | = | 60000 | + | 3 | x |
2 | x | − | 3 | x | = | 60000 | − | 80000 |
- | x | = | 60000 | − | 80000 |
- | x | = | 60000 | − | 80000 |
- | x | = | - | 20000 |
20000 | = | x |
x | = | 20000 |