7 20 | = | 7 125 | x | ÷ | ( | 1 | + | ( | x | − | 1 | ) | × | 7 125 | ) |
方程两边同时乘以: | ( | 1 | + | ( | x | − | 1 | ) | × | 7 125 | ) |
7 20 | ( | 1 | + | ( | x | − | 1 | ) | × | 7 125 | ) | = | 7 125 | x |
7 20 | × | 1 | + | 7 20 | ( | x | − | 1 | ) | × | 7 125 | = | 7 125 | x |
7 20 | + | 49 2500 | ( | x | − | 1 | ) | = | 7 125 | x |
7 20 | + | 49 2500 | x | − | 49 2500 | × | 1 | = | 7 125 | x |
7 20 | + | 49 2500 | x | − | 49 2500 | = | 7 125 | x |
413 1250 | + | 49 2500 | x | = | 7 125 | x |
49 2500 | x | − | 7 125 | x | = | - | 413 1250 |
- | 91 2500 | x | = | - | 413 1250 |
413 1250 | = | 91 2500 | x |
91 2500 | x | = | 413 1250 |
x | = | 413 1250 | ÷ | 91 2500 |
= | 413 1250 | × | 2500 91 |
= | 59 | × | 2 13 |
x | = | 118 13 |
x | = | 9.076923 |