( | 25 | × | 2 | + | 2 | x | ) | × | 9 10 | = | 25 | × | 2 | + | 2 | ( | x | + | 4 | ) |
方程左边 = | 25 | × | 2 | × | 9 10 | + | 2 | x | × | 9 10 |
= | 45 | + | 9 5 | x |
45 | + | 9 5 | x | = | 25 | × | 2 | + | 2 | ( | x | + | 4 | ) |
方程右边 = | 50 | + | 2 | ( | x | + | 4 | ) |
45 | + | 9 5 | x | = | 50 | + | 2 | ( | x | + | 4 | ) |
方程右边 = | 50 | + | 2 | x | + | 2 | × | 4 |
= | 50 | + | 2 | x | + | 8 |
= | 58 | + | 2 | x |
45 | + | 9 5 | x | = | 58 | + | 2 | x |
9 5 | x | − | 2 | x | = | 58 | − | 45 |
- | 1 5 | x | = | 58 | − | 45 |
- | 1 5 | x | = | 13 |
- | 13 | = | 1 5 | x |
1 5 | x | = | - | 13 |
x | = | - | 13 | ÷ | 1 5 |
= | - | 13 | × | 5 |
x | = | - | 65 |