( | y | − | 750 | ) | ( | 250 | − | 1 | ÷ | 5 | ) | = | 12000 |
方程左边 = | y | ( | 250 | − | 1 | ÷ | 5 | ) | − | 750 | ( | 250 | − | 1 | ÷ | 5 | ) |
= | y | × | 250 | − | y | × | 1 | ÷ | 5 | − | 750 | ( | 250 | − | 1 | ÷ | 5 | ) |
= | y | × | 250 | − | y | × | 1 5 | − | 750 | ( | 250 | − | 1 | ÷ | 5 | ) |
= | 1249 5 | y | − | 750 | ( | 250 | − | 1 | ÷ | 5 | ) |
= | 1249 5 | y | − | 750 | × | 250 | + | 750 | × | 1 | ÷ | 5 |
= | 1249 5 | y | − | 187500 | + | 150 |
= | 1249 5 | y | − | 187350 |
1249 5 | y | − | 187350 | = | 12000 |
1249 5 | y | = | 12000 | + | 187350 |
1249 5 | y | = | 199350 |
y | = | 199350 | ÷ | 1249 5 |
= | 199350 | × | 5 1249 |
y | = | 996750 1249 |
y | = | 798.038431 |