| 500000 | ( | 1 | + | 2 | x | ) | ( | 1 | + | x | ) | = | 660000 |
| 方程左边 = | 500000 | × | 1 | ( | 1 | + | x | ) | + | 500000 | × | 2 | x | ( | 1 | + | x | ) |
| = | 500000 | ( | 1 | + | x | ) | + | 1000000 | x | ( | 1 | + | x | ) |
| = | 500000 | × | 1 | + | 500000 | x | + | 1000000 | x | ( | 1 | + | x | ) |
| = | 500000 | + | 500000 | x | + | 1000000 | x | ( | 1 | + | x | ) |
| = | 500000 | + | 500000 | x | + | 1000000 | x | × | 1 | + | 1000000 | x | x |
| = | 500000 | + | 500000 | x | + | 1000000 | x | + | 1000000 | x | x |
| = | 500000 | + | 1500000 | x | + | 1000000 | x | x |
| 500000 | + | 1500000 | x | + | 1000000 | x | x | = | 660000 |
| x2= | 1 10 |