| 64 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 100 |
| 方程左边 = | 64 | × | 1 | ( | 1 | + | x | ) | + | 64 | x | ( | 1 | + | x | ) |
| = | 64 | ( | 1 | + | x | ) | + | 64 | x | ( | 1 | + | x | ) |
| = | 64 | × | 1 | + | 64 | x | + | 64 | x | ( | 1 | + | x | ) |
| = | 64 | + | 64 | x | + | 64 | x | ( | 1 | + | x | ) |
| = | 64 | + | 64 | x | + | 64 | x | × | 1 | + | 64 | x | x |
| = | 64 | + | 64 | x | + | 64 | x | + | 64 | x | x |
| = | 64 | + | 128 | x | + | 64 | x | x |
| 64 | + | 128 | x | + | 64 | x | x | = | 100 |
| x1= | - | 9 4 |
| x2= | 1 4 |