270 | ÷ | x | = | ( | 100 | + | ( | x | − | 100 | ) | × | 2 5 | ) | ÷ | x |
方程两边同时乘以: | x |
270 | = | ( | 100 | + | ( | x | − | 100 | ) | × | 2 5 | ) | ÷ | 1 | × | 1 |
270 | = | 100 | ÷ | 1 | × | 1 | + | ( | x | − | 100 | ) | × | 2 5 | ÷ | 1 | × | 1 |
270 | = | 100 | + | ( | x | − | 100 | ) | × | 2 5 |
270 | = | 100 | + | x | × | 2 5 | − | 100 | × | 2 5 |
270 | = | 100 | + | x | × | 2 5 | − | 40 |
270 | = | 60 | + | 2 5 | x |
- | 2 5 | x | = | 60 | − | 270 |
- | 2 5 | x | = | - | 210 |
210 | = | 2 5 | x |
2 5 | x | = | 210 |
x | = | 210 | ÷ | 2 5 |
= | 210 | × | 5 2 |
= | 105 | × | 5 |
x | = | 525 |