| ( | 1 | + | a% | ) | + | ( | 1 | − | a% | ) | ( | 1 | + | 3 | × | a% | ) | = | ( | 1 | + | 29 | ÷ | 25 | ) | × | a% |
| 方程左边 = | 1 | + | a% | + | ( | 1 | − | a% | ) | ( | 1 | + | 3 | × | a% | ) |
| = | 1 | + | a% | + | 1 | ( | 1 | + | 3 | × | a% | ) | − | a% | ( | 1 | + | 3 | × | a% | ) |
| = | 1 | + | a% | + | 1 | × | 1 | + | 1 | × | 3 | × | a% | − | a% | ( | 1 | + | 3 | × | a% | ) |
| = | 1 | + | a% | + | 1 | + | 3 100 | a | − | a% | ( | 1 | + | 3 | × | a% | ) |
| = | 2 | + | a% | + | 3 100 | a | − | a% | ( | 1 | + | 3 | × | a% | ) |
| = | 2 | + | a% | + | 3 100 | a | − | a% | × | 1 | − | a% | × | 3 | × | a% |
| = | 2 | + | a% | + | 3 100 | a | − | a% | − | 3 10000 | a | a |
| 2 | + | a% | + | 3 100 | a | − | a% | − | 3 10000 | a | a | = | ( | 1 | + | 29 | ÷ | 25 | ) | × | a% |
| 方程右边 = | 1 | × | a% | + | 29 | ÷ | 25 | × | a% |
| = | 1 100 | a | + | 29 2500 | a |
| = | 27 1250 | a |
| 2 | + | a% | + | 3 100 | a | − | a% | − | 3 10000 | a | a | = | 27 1250 | a |