( | 80 | + | 70 | ) | ÷ | ( | 80 100 | − | 75 100 | ) | = | x |
方程两边同时乘以: | ( | 80 100 | − | 75 100 | ) |
( | 80 | + | 70 | ) | = | x | ( | 80 100 | − | 75 100 | ) |
80 | + | 70 | = | x | ( | 80 100 | − | 75 100 | ) |
80 | + | 70 | = | x | × | 80 100 | − | x | × | 75 100 |
150 | = | 1 20 | x |
- | 1 20 | x | = | - | 150 |
150 | = | 1 20 | x |
1 20 | x | = | 150 |
x | = | 150 | ÷ | 1 20 |
= | 150 | × | 20 |
x | = | 3000 |