( | x | ÷ | 5 | + | x | ÷ | 4 | ) | − | ( | x | ÷ | 4 | + | x | ÷ | 16 5 | ) | = | 9 10 |
方程左边 = | x | ÷ | 5 | + | x | ÷ | 4 | − | ( | x | ÷ | 4 | + | x | ÷ | 16 5 | ) |
= | 9 20 | x | − | ( | x | ÷ | 4 | + | x | ÷ | 16 5 | ) |
= | 9 20 | x | − | x | ÷ | 4 | − | x | ÷ | 16 5 |
= | - | 9 80 | x |
- | 9 80 | x | = | 9 10 |
- | 9 10 | = | 9 80 | x |
9 80 | x | = | - | 9 10 |
x | = | - | 9 10 | ÷ | 9 80 |
= | - | 9 10 | × | 80 9 |
= | - | 1 | × | 8 |
x | = | - | 8 |