3 | N | × | 129 | × | 1 5 | + | 400 | = | N | × | 129 | × | 4 5 | − | 400 |
方程左边 = | 387 5 | N | + | 400 |
387 5 | N | + | 400 | = | N | × | 129 | × | 4 5 | − | 400 |
方程右边 = | N | × | 516 5 | − | 400 |
387 5 | N | + | 400 | = | 516 5 | N | − | 400 |
387 5 | N | − | 516 5 | N | = | - | 400 | − | 400 |
- | 129 5 | N | = | - | 400 | − | 400 |
- | 129 5 | N | = | - | 800 |
800 | = | 129 5 | N |
129 5 | N | = | 800 |
N | = | 800 | ÷ | 129 5 |
= | 800 | × | 5 129 |
N | = | 4000 129 |
N | = | 31.007752 |