27 10 | ( | 1 | − | 1 | ÷ | 3 | ) | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | = | 6 5 | ( | 1 | + | 50 100 | ) |
| 方程左边 = | 27 10 | × | 1 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 27 10 | × | 1 | ÷ | 3 | × | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | × | 1 | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | + | 27 10 | × | 6 | × | a% | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | + | 81 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | × | 1 | − | 27 10 | × | 15 | ÷ | 4 | × | a% | + | 81 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | − | 81 800 | a | + | 81 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | − | 81 800 | a | + | 81 500 | a | × | 1 | − | 81 500 | a | × | 15 | ÷ | 4 | × | a% | − | 9 10 |
| = | 27 10 | − | 81 800 | a | + | 81 500 | a | − | 243 40000 | a | a | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | + | 243 4000 | a | − | 243 40000 | a | a | − | 9 10 | ( | 1 | + | 6 | × | a% | ) | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | + | 243 4000 | a | − | 243 40000 | a | a | − | 9 10 | × | 1 | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 9 10 | × | 6 | × | a% |
| = | 27 10 | + | 243 4000 | a | − | 243 40000 | a | a | − | 9 10 | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) | − | 27 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 27 10 | + | 243 4000 | a | − | 243 40000 | a | a | − | 9 10 | × | 1 | + | 9 10 | × | 15 | ÷ | 4 | × | a% |
| = | 27 10 | + | 243 4000 | a | − | 243 40000 | a | a | − | 9 10 | + | 27 800 | a | − | 27 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 9 5 | + | 189 2000 | a | − | 243 40000 | a | a | − | 27 500 | a | ( | 1 | − | 15 | ÷ | 4 | × | a% | ) |
| = | 9 5 | + | 189 2000 | a | − | 243 40000 | a | a | − | 27 500 | a | × | 1 | + | 27 500 | a | × | 15 |
| = | 9 5 | + | 189 2000 | a | − | 243 40000 | a | a | − | 27 500 | a | + | 81 40000 | a | a |
| = | 9 5 | + | 81 2000 | a | − | 243 40000 | a | a | + | 81 40000 | a | a |
9 5 | + | 81 2000 | a | − | 243 40000 | a | a | + | 81 40000 | a | a | = | 6 5 | ( | 1 | + | 50 100 | ) |
| 方程右边 = | 6 5 | × | 1 | + | 6 5 | × | 50 100 |
| = | 6 5 | + | 3 5 |
| = | 9 5 |
9 5 | + | 81 2000 | a | − | 243 40000 | a | a | + | 81 40000 | a | a | = | 9 5 |