| 24 | ( | 1 | − | 1 | ÷ | 3 | × | a | ) | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | = | 800 |
| 方程左边 = | 24 | × | 1 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 24 | × | 1 | ÷ | 3 | × | a | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 8 | a | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | × | 1 | + | 24 | × | 2 | ÷ | 5 | × | a | − | 8 | a | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | + | 48 5 | a | − | 8 | a | ( | 1 | + | 2 | ÷ | 5 | × | a | ) | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | + | 48 5 | a | − | 8 | a | × | 1 | − | 8 | a | × | 2 | ÷ | 5 | × | a | − | 16 |
| = | 24 | + | 48 5 | a | − | 8 | a | − | 16 5 | a | a | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | + | 8 5 | a | − | 16 5 | a | a | − | 16 | ( | 1 | + | 2 | ÷ | 5 | × | a | ) |
| = | 24 | + | 8 5 | a | − | 16 5 | a | a | − | 16 | × | 1 | − | 16 | × | 2 | ÷ | 5 | × | a |
| = | 24 | + | 8 5 | a | − | 16 5 | a | a | − | 16 | − | 32 5 | a |
| = | 8 | − | 24 5 | a | − | 16 5 | a | a |
| 8 | − | 24 5 | a | − | 16 5 | a | a | = | 800 |