7 10 | = | ( | 1 | × | 1 | + | n | × | 199 200 | ) | ÷ | 1 | + | n |
方程右边 = | 1 | × | 1 | × | 1 | + | n | × | 199 200 | × | 1 | + | n |
= | 1 | + | n | × | 199 200 | + | n |
= | 1 | + | 399 200 | n |
7 10 | = | 1 | + | 399 200 | n |
- | 399 200 | n | = | 1 | − | 7 10 |
- | 399 200 | n | = | 3 10 |
- | 3 10 | = | 399 200 | n |
399 200 | n | = | - | 3 10 |
n | = | - | 3 10 | ÷ | 399 200 |
= | - | 3 10 | × | 200 399 |
= | - | 1 | × | 20 133 |
n | = | - | 20 133 |
n | = | - 0.150376 |