| ( | 7 1000 | × | 252 125 | + | 1 2 | x | ) | ÷ | ( | 252 125 | + | x | ) | − | 9 1000 | = | 0 |
| 方程两边同时乘以: | ( | 252 125 | + | x | ) |
| ( | 7 1000 | × | 252 125 | + | 1 2 | x | ) | − | 9 1000 | ( | 252 125 | + | x | ) | = | 0 |
7 1000 | × | 252 125 | + | 1 2 | x | − | 9 1000 | ( | 252 125 | + | x | ) | = | 0 |
441 31250 | + | 1 2 | x | − | 9 1000 | ( | 252 125 | + | x | ) | = | 0 |
441 31250 | + | 1 2 | x | − | 9 1000 | × | 252 125 | − | 9 1000 | x | = | 0 |
441 31250 | + | 1 2 | x | − | 567 31250 | − | 9 1000 | x | = | 0 |
| - | 63 15625 | + | 491 1000 | x | = | 0 |
491 1000 | x | = | 0 | + | 63 15625 |
491 1000 | x | = | 63 15625 |
| x | = | 63 15625 | ÷ | 491 1000 |
| = | 63 15625 | × | 1000 491 |
| = | 63 125 | × | 8 491 |
| x | = | 504 61375 |
| x | = | 0.008212 |