| ( | 5 | − | x | x | ) | × | 5 2 | − | 1 2 | ( | x | + | 3 | ) | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | ( | 2 | − | x | ) | ( | 2 | − | 1 2 | x | x | ) | = | 5 |
| 方程左边 = | 5 | × | 5 2 | − | x | x | × | 5 2 | − | 1 2 | ( | x | + | 3 | ) | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | ( | 2 | − | x | ) | ( | 2 | − | 1 2 | x | x | ) |
| = | 25 2 | − | x | x | × | 5 2 | − | 1 2 | ( | x | + | 3 | ) | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | ( | 2 | − | x | ) | ( | 2 | − | 1 2 | x | x | ) |
| = | 25 2 | − | x | x | × | 5 2 | − | 1 2 | x | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | × | 3 | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | ( | 2 | − | x | ) |
| = | 25 2 | − | x | x | × | 5 2 | − | 1 2 | x | ( | 9 2 | − | 1 2 | x | x | ) | − | 3 2 | ( | 9 2 | − | 1 2 | x | x | ) | − | 1 2 | ( | 2 | − | x | ) | ( | 2 | − | 1 2 | x | x | ) |
| = | 25 2 | − | x | x | × | 5 2 | − | 1 2 | x | × | 9 2 | + | 1 2 | x | × | 1 2 | x | x |
| = | 25 2 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | − | 3 2 | ( | 9 2 | − | 1 2 | x | x | ) |
| = | 25 2 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | − | 3 2 | × | 9 2 |
| = | 25 2 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | − | 27 4 | + | 3 4 |
| = | 23 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 23 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 23 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 23 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 23 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 15 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 15 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 15 4 | − | x | x | × | 5 2 | − | 9 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
| = | 15 4 | − | x | x | × | 5 2 | − | 5 4 | x | + | 1 4 | x | x | x | + | 3 4 | x |
15 4 | − | x | x | × | 5 2 | − | 5 4 | x | + | 1 4 | x | x | x | + | 3 4 | x | = | 5 |