7 10 | = | ( | 1 | × | 1 | + | n | × | 199 200 | ) | ÷ | ( | 1 | + | n | ) |
方程两边同时乘以: | ( | 1 | + | n | ) |
7 10 | ( | 1 | + | n | ) | = | ( | 1 | × | 1 | + | n | × | 199 200 | ) |
7 10 | × | 1 | + | 7 10 | n | = | ( | 1 | × | 1 | + | n | × | 199 200 | ) |
7 10 | × | 1 | + | 7 10 | n | = | 1 | × | 1 | + | n | × | 199 200 |
7 10 | + | 7 10 | n | = | 1 | + | n | × | 199 200 |
7 10 | n | − | 199 200 | n | = | 1 | − | 7 10 |
- | 59 200 | n | = | 1 | − | 7 10 |
- | 59 200 | n | = | 3 10 |
- | 3 10 | = | 59 200 | n |
59 200 | n | = | - | 3 10 |
n | = | - | 3 10 | ÷ | 59 200 |
= | - | 3 10 | × | 200 59 |
= | - | 3 | × | 20 59 |
n | = | - | 60 59 |
n | = | - 1.016949 |