9 25 | ( | U | − | 4 | ) | = | 1 5 | ( | U | − | 12 5 | ) |
方程左边 = | 9 25 | U | − | 9 25 | × | 4 |
= | 9 25 | U | − | 36 25 |
9 25 | U | − | 36 25 | = | 1 5 | ( | U | − | 12 5 | ) |
方程右边 = | 1 5 | U | − | 1 5 | × | 12 5 |
= | 1 5 | U | − | 12 25 |
9 25 | U | − | 36 25 | = | 1 5 | U | − | 12 25 |
9 25 | U | − | 1 5 | U | = | - | 12 25 | + | 36 25 |
4 25 | U | = | - | 12 25 | + | 36 25 |
4 25 | U | = | 24 25 |
U | = | 24 25 | ÷ | 4 25 |
= | 24 25 | × | 25 4 |
= | 6 | × | 1 |
U | = | 6 |