7 10 | = | ( | 1 | × | 511 500 | + | n | × | 199 200 | ) | ÷ | 1 | + | n |
方程右边 = | 1 | × | 511 500 | × | 1 | + | n | × | 199 200 | × | 1 | + | n |
= | 511 500 | + | n | × | 199 200 | + | n |
= | 511 500 | + | 399 200 | n |
7 10 | = | 511 500 | + | 399 200 | n |
- | 399 200 | n | = | 511 500 | − | 7 10 |
- | 399 200 | n | = | 161 500 |
- | 161 500 | = | 399 200 | n |
399 200 | n | = | - | 161 500 |
n | = | - | 161 500 | ÷ | 399 200 |
= | - | 161 500 | × | 200 399 |
= | - | 23 5 | × | 2 57 |
n | = | - | 46 285 |
n | = | - 0.161404 |