30 | a | × | 165 | + | 250 | × | 24 | ( | 1 | − | 1 20 | a | ) | = | 47250 |
方程左边 = | 4950 | a | + | 6000 | ( | 1 | − | 1 20 | a | ) |
4950 | a | + | 6000 | ( | 1 | − | 1 20 | a | ) | = | 47250 |
方程左边 = | 4950 | a | + | 6000 | × | 1 | − | 6000 | × | 1 20 | a |
= | 4950 | a | + | 6000 | − | 300 | a |
= | 4650 | a | + | 6000 |
4650 | a | + | 6000 | = | 47250 |
4650 | a | = | 47250 | − | 6000 |
4650 | a | = | 41250 |
a | = | 41250 | ÷ | 4650 |
= | 41250 | × | 1 4650 |
= | 275 | × | 1 31 |
a | = | 275 31 |
a | = | 8.870968 |