105 | + | ( | 105 | − | 100 | ) | ( | b | × | 1 200 | ) | = | 7553 10 |
方程左边 = | 105 | + | 105 | ( | b | × | 1 200 | ) | − | 100 | ( | b | × | 1 200 | ) |
= | 105 | + | 105 | b | × | 1 200 | − | 100 | ( | b | × | 1 200 | ) |
= | 105 | + | 21 40 | b | − | 100 | ( | b | × | 1 200 | ) |
= | 105 | + | 21 40 | b | − | 100 | b | × | 1 200 |
= | 105 | + | 21 40 | b | − | 1 2 | b |
= | 105 | + | 1 40 | b |
105 | + | 1 40 | b | = | 7553 10 |
1 40 | b | = | 7553 10 | − | 105 |
1 40 | b | = | 6503 10 |
b | = | 6503 10 | ÷ | 1 40 |
= | 6503 10 | × | 40 |
= | 6503 | × | 4 |
b | = | 26012 |