| ( | 3 1000 | × | 2 | + | 1 2 | x | ) | ÷ | ( | 2 | + | x | ) | − | 1 200 | = | 0 |
| 方程两边同时乘以: | ( | 2 | + | x | ) |
| ( | 3 1000 | × | 2 | + | 1 2 | x | ) | − | 1 200 | ( | 2 | + | x | ) | = | 0 |
3 1000 | × | 2 | + | 1 2 | x | − | 1 200 | ( | 2 | + | x | ) | = | 0 |
3 500 | + | 1 2 | x | − | 1 200 | ( | 2 | + | x | ) | = | 0 |
3 500 | + | 1 2 | x | − | 1 200 | × | 2 | − | 1 200 | x | = | 0 |
3 500 | + | 1 2 | x | − | 1 100 | − | 1 200 | x | = | 0 |
| - | 1 250 | + | 99 200 | x | = | 0 |
99 200 | x | = | 0 | + | 1 250 |
99 200 | x | = | 1 250 |
| x | = | 1 250 | ÷ | 99 200 |
| = | 1 250 | × | 200 99 |
| = | 1 5 | × | 4 99 |
| x | = | 4 495 |
| x | = | 0.008081 |