25 | ( | 4000 | × | 3 4 | − | 2500 | ) | = | 25 | ( | 2500 | y | ÷ | 10 | − | 1500 | ) |
方程左边 = | 25 | × | 4000 | × | 3 4 | − | 25 | × | 2500 |
= | 75000 | − | 62500 |
= | 12500 |
12500 | = | 25 | ( | 2500 | y | ÷ | 10 | − | 1500 | ) |
方程右边 = | 25 | × | 2500 | y | ÷ | 10 | − | 25 | × | 1500 |
= | 6250 | y | − | 37500 |
12500 | = | 6250 | y | − | 37500 |
- | 6250 | y | = | - | 37500 | − | 12500 |
- | 6250 | y | = | - | 50000 |
50000 | = | 6250 | y |
6250 | y | = | 50000 |
y | = | 50000 | ÷ | 6250 |
= | 50000 | × | 1 6250 |
= | 8 | × | 1 |
y | = | 8 |