2 5 | ( | 16 25 | x | x | + | 2 | x | − | 2 | x | x | + | 69 50 | + | 69 50 | x | x | ) | = | 16 25 | x | x | + | x | ( | 1 | − | x | ) |
| 方程左边 = | 2 5 | × | 16 25 | x | x | + | 2 5 | × | 2 | x | − | 2 5 | × | 2 | x | x | + | 2 5 |
| = | 32 125 | x | x | + | 4 5 | x | − | 4 5 | x | x | + | 69 125 | + | 69 125 | x | x |
| = | 32 125 | x | x | − | 38 125 | x | − | 4 5 | x | x | + | 69 125 | + | 69 125 | x | x |
32 125 | x | x | − | 38 125 | x | − | 4 5 | x | x | + | 69 125 | + | 69 125 | x | x | = | 16 25 | x | x | + | x | ( | 1 | − | x | ) |
| 方程右边 = | 16 25 | x | x | + | x | × | 1 | − | x | x |
32 125 | x | x | − | 38 125 | x | − | 4 5 | x | x | + | 69 125 | + | 69 125 | x | x | = | 16 25 | x | x | + | 1 | x | − | x | x |