480000 | = | 20000 | p | ( | 1 | − | 5 100 | ) | − | 1040000 |
方程右边 = | 20000 | p | × | 1 | − | 20000 | p | × | 5 100 | − | 1040000 |
= | 20000 | p | − | 1000 | p | − | 1040000 |
= | 19000 | p | − | 1040000 |
480000 | = | 19000 | p | − | 1040000 |
- | 19000 | p | = | - | 1040000 | − | 480000 |
- | 19000 | p | = | - | 1520000 |
1520000 | = | 19000 | p |
19000 | p | = | 1520000 |
p | = | 1520000 | ÷ | 19000 |
= | 1520000 | × | 1 19000 |
= | 80 | × | 1 |
p | = | 80 |