( | x | + | 2 | ) | ÷ | 5 | − | ( | x | − | 1 | ) | ÷ | 4 | = | 0 |
方程左边 = | x | × | 1 5 | + | 2 | × | 1 5 | − | ( | x | − | 1 | ) | × | 1 4 |
= | x | × | 1 5 | + | 2 5 | − | ( | x | − | 1 | ) | × | 1 4 |
= | 1 5 | x | + | 2 5 | − | x | × | 1 4 | + | 1 | × | 1 4 |
= | 1 5 | x | + | 2 5 | − | x | × | 1 4 | + | 1 4 |
= | - | 1 20 | x | + | 13 20 |
- | 1 20 | x | + | 13 20 | = | 0 |
- | 1 20 | x | = | 0 | − | 13 20 |
- | 1 20 | x | = | - | 13 20 |
13 20 | = | 1 20 | x |
1 20 | x | = | 13 20 |
x | = | 13 20 | ÷ | 1 20 |
= | 13 20 | × | 20 |
= | 13 | × | 1 |
x | = | 13 |