2 | × | 280 | ÷ | x | + | 40 | = | 280 | − | 2 | × | 208 | ÷ | x |
方程两边同时乘以: | x |
2 | × | 280 | + | 40 | x | = | 280 | x | − | 2 | × | 208 | ÷ | 1 | × | 1 |
40 | x | − | 280 | x | = | - | 2 | × | 208 | ÷ | 1 | × | 1 | − | 2 | × | 280 |
40 | x | − | 280 | x | = | - | 416 | − | 560 |
- | 240 | x | = | - | 416 | − | 560 |
- | 240 | x | = | - | 976 |
976 | = | 240 | x |
240 | x | = | 976 |
x | = | 976 | ÷ | 240 |
= | 976 | × | 1 240 |
= | 61 | × | 1 15 |
x | = | 61 15 |
x | = | 4.066667 |