19 20 | = | 9 10 | x | ÷ | ( | 1 | + | ( | x | − | 1 | ) | × | 9 10 | ) |
| 方程两边同时乘以: | ( | 1 | + | ( | x | − | 1 | ) | × | 9 10 | ) |
19 20 | ( | 1 | + | ( | x | − | 1 | ) | × | 9 10 | ) | = | 9 10 | x |
19 20 | × | 1 | + | 19 20 | ( | x | − | 1 | ) | × | 9 10 | = | 9 10 | x |
19 20 | + | 171 200 | ( | x | − | 1 | ) | = | 9 10 | x |
19 20 | + | 171 200 | x | − | 171 200 | × | 1 | = | 9 10 | x |
19 20 | + | 171 200 | x | − | 171 200 | = | 9 10 | x |
19 200 | + | 171 200 | x | = | 9 10 | x |
171 200 | x | − | 9 10 | x | = | - | 19 200 |
| - | 9 200 | x | = | - | 19 200 |
19 200 | = | 9 200 | x |
9 200 | x | = | 19 200 |
| x | = | 19 200 | ÷ | 9 200 |
| = | 19 200 | × | 200 9 |
| = | 19 | × | 1 9 |
| x | = | 19 9 |
| x | = | 2.111111 |