| 24 | × | 445 | ( | 1 | + | a | ) | + | 24 | × | 545 | ( | 1 | + | a | ) | ( | 1 | + | 2 | a | ) | = | 21600 | ( | 1 | + | 20 | a | ÷ | 9 | ) |
| 方程左边 = | 10680 | ( | 1 | + | a | ) | + | 13080 | ( | 1 | + | a | ) | ( | 1 | + | 2 | a | ) |
| 10680 | ( | 1 | + | a | ) | + | 13080 | ( | 1 | + | a | ) | ( | 1 | + | 2 | a | ) | = | 21600 | ( | 1 | + | 20 | a | ÷ | 9 | ) |
| 方程左边 = | 10680 | × | 1 | + | 10680 | a | + | 13080 | ( | 1 | + | a | ) | ( | 1 | + | 2 | a | ) |
| = | 10680 | + | 10680 | a | + | 13080 | ( | 1 | + | a | ) | ( | 1 | + | 2 | a | ) |
| = | 10680 | + | 10680 | a | + | 13080 | × | 1 | ( | 1 | + | 2 | a | ) | + | 13080 | a | ( | 1 | + | 2 | a | ) |
| = | 10680 | + | 10680 | a | + | 13080 | ( | 1 | + | 2 | a | ) | + | 13080 | a | ( | 1 | + | 2 | a | ) |
| = | 10680 | + | 10680 | a | + | 13080 | × | 1 | + | 13080 | × | 2 | a | + | 13080 | a | ( | 1 | + | 2 | a | ) |
| = | 10680 | + | 10680 | a | + | 13080 | + | 26160 | a | + | 13080 | a | ( | 1 | + | 2 | a | ) |
| = | 23760 | + | 36840 | a | + | 13080 | a | ( | 1 | + | 2 | a | ) |
| = | 23760 | + | 36840 | a | + | 13080 | a | × | 1 | + | 13080 | a | × | 2 | a |
| = | 23760 | + | 36840 | a | + | 13080 | a | + | 26160 | a | a |
| = | 23760 | + | 49920 | a | + | 26160 | a | a |
| 23760 | + | 49920 | a | + | 26160 | a | a | = | 21600 | ( | 1 | + | 20 | a | ÷ | 9 | ) |
| 方程右边 = | 21600 | × | 1 | + | 21600 | × | 20 | a | ÷ | 9 |
| = | 21600 | + | 48000 | a |
| 23760 | + | 49920 | a | + | 26160 | a | a | = | 21600 | + | 48000 | a |