( | 1 | ÷ | 1000 | ) | − | 1 | ÷ | x | = | 4000 |
方程两边同时乘以: | x |
( | 1 | ÷ | 1000 | ) | x | − | 1 | = | 4000 | x |
1 | ÷ | 1000 | × | x | − | 1 | = | 4000 | x |
1 1000 | x | − | 1 | = | 4000 | x |
1 1000 | x | − | 4000 | x | = | 1 |
- | 3999999 1000 | x | = | 1 |
- | 1 | = | 3999999 1000 | x |
3999999 1000 | x | = | - | 1 |
x | = | - | 1 | ÷ | 3999999 1000 |
= | - | 1 | × | 1000 3999999 |
x | = | - | 1000 3999999 |
x | = | - 0.00025 |