11 250 | X | ( | 1 | − | 1 1000 | X | ) | ÷ | ( | 1 | + | 9 1000 | X | ) | = | 419 250 |
| 方程两边同时乘以: | ( | 1 | + | 9 1000 | X | ) |
11 250 | X | ( | 1 | − | 1 1000 | X | ) | = | 419 250 | ( | 1 | + | 9 1000 | X | ) |
11 250 | X | × | 1 | − | 11 250 | X | × | 1 1000 | X | = | 419 250 | ( | 1 | + | 9 1000 | X | ) |
11 250 | X | × | 1 | − | 11 250 | X | × | 1 1000 | X | = | 419 250 | × | 1 | + | 419 250 | × | 9 1000 | X |
11 250 | X | − | 11 250000 | X | X | = | 419 250 | + | 3771 250000 | X |