Q | ( | 25440 | − | 12 | Q | ) | = | ( | 15 | Q | − | 4200 | ) | ( | 2300 | − | Q | ) |
方程左边 = | Q | × | 25440 | − | Q | × | 12 | Q |
25440 | Q | − | Q | × | 12 | Q | = | ( | 15 | Q | − | 4200 | ) | ( | 2300 | − | Q | ) |
方程右边 = | 15 | Q | ( | 2300 | − | Q | ) | − | 4200 | ( | 2300 | − | Q | ) |
= | 15 | Q | × | 2300 | − | 15 | Q | Q | − | 4200 | ( | 2300 | − | Q | ) |
= | 34500 | Q | − | 15 | Q | Q | − | 4200 | ( | 2300 | − | Q | ) |
= | 34500 | Q | − | 15 | Q | Q | − | 4200 | × | 2300 | + | 4200 | Q |
= | 34500 | Q | − | 15 | Q | Q | − | 9660000 | + | 4200 | Q |
= | 38700 | Q | − | 15 | Q | Q | − | 9660000 |
25440 | Q | − | Q | × | 12 | Q | = | 38700 | Q | − | 15 | Q | Q | − | 9660000 |