| a | a | ( | 1 | + | 4 | ) | = | 100 | ( | 1 | + | 1 4 | ) | ( | 1 | + | 1 | ÷ | 25 | ) |
| 方程左边 = | a | a | × | 1 | + | a | a | × | 4 |
| a | a | × | 1 | + | a | a | × | 4 | = | 100 | ( | 1 | + | 1 4 | ) | ( | 1 | + | 1 | ÷ | 25 | ) |
| 方程右边 = | 100 | × | 1 | ( | 1 | + | 1 | ÷ | 25 | ) | + | 100 | × | 1 4 | ( | 1 | + | 1 | ÷ | 25 | ) |
| = | 100 | ( | 1 | + | 1 | ÷ | 25 | ) | + | 25 | ( | 1 | + | 1 | ÷ | 25 | ) |
| = | 100 | × | 1 | + | 100 | × | 1 | ÷ | 25 | + | 25 | ( | 1 | + | 1 | ÷ | 25 | ) |
| = | 100 | + | 4 | + | 25 | ( | 1 | + | 1 | ÷ | 25 | ) |
| = | 104 | + | 25 | ( | 1 | + | 1 | ÷ | 25 | ) |
| = | 104 | + | 25 | × | 1 | + | 25 | × | 1 | ÷ | 25 |
| = | 104 | + | 25 | + | 1 |
| = | 130 |
| a | a | × | 1 | + | a | a | × | 4 | = | 130 |