219 25 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 1404 125 |
| 方程左边 = | 219 25 | × | 1 | ( | 1 | + | x | ) | + | 219 25 | x | ( | 1 | + | x | ) |
| = | 219 25 | ( | 1 | + | x | ) | + | 219 25 | x | ( | 1 | + | x | ) |
| = | 219 25 | × | 1 | + | 219 25 | x | + | 219 25 | x | ( | 1 | + | x | ) |
| = | 219 25 | + | 219 25 | x | + | 219 25 | x | ( | 1 | + | x | ) |
| = | 219 25 | + | 219 25 | x | + | 219 25 | x | × | 1 | + | 219 25 | x | x |
| = | 219 25 | + | 219 25 | x | + | 219 25 | x | + | 219 25 | x | x |
| = | 219 25 | + | 438 25 | x | + | 219 25 | x | x |
219 25 | + | 438 25 | x | + | 219 25 | x | x | = | 1404 125 |