| 130000 | = | 100000 | ( | 1 | + | x | ) | x | ( | 1 | + | x | ) |
| 方程右边 = | 100000 | × | 1 | x | ( | 1 | + | x | ) | + | 100000 | x | x | ( | 1 | + | x | ) |
| = | 100000 | x | ( | 1 | + | x | ) | + | 100000 | x | x | ( | 1 | + | x | ) |
| = | 100000 | x | × | 1 | + | 100000 | x | x | + | 100000 | x | x | ( | 1 | + | x | ) |
| = | 100000 | x | + | 100000 | x | x | + | 100000 | x | x | ( | 1 | + | x | ) |
| = | 100000 | x | + | 100000 | x | x | + | 100000 | x | x | × | 1 | + | 100000 | x | x |
| = | 100000 | x | + | 100000 | x | x | + | 100000 | x | x | + | 100000 | x | x | x |
| 130000 | = | 100000 | x | + | 100000 | x | x | + | 100000 | x | x | + | 100000 | x | x | x |