N | × | 129 | × | 1 5 | + | 400 | = | 3 | ( | N | × | 129 | × | 1 5 | + | 400 | ) |
方程左边 = | N | × | 129 5 | + | 400 |
129 5 | N | + | 400 | = | 3 | ( | N | × | 129 | × | 1 5 | + | 400 | ) |
方程右边 = | 3 | N | × | 129 | × | 1 5 | + | 3 | × | 400 |
= | 387 5 | N | + | 1200 |
129 5 | N | + | 400 | = | 387 5 | N | + | 1200 |
129 5 | N | − | 387 5 | N | = | 1200 | − | 400 |
- | 258 5 | N | = | 1200 | − | 400 |
- | 258 5 | N | = | 800 |
- | 800 | = | 258 5 | N |
258 5 | N | = | - | 800 |
N | = | - | 800 | ÷ | 258 5 |
= | - | 800 | × | 5 258 |
= | - | 400 | × | 5 129 |
N | = | - | 2000 129 |
N | = | - 15.503876 |