| 100 | p | = | 413 1000 | ( | 100 | − | p | ) | ( | 100 | − | p | ) |
| 方程右边 = | 413 1000 | × | 100 | ( | 100 | − | p | ) | − | 413 1000 | p | ( | 100 | − | p | ) |
| = | 413 10 | ( | 100 | − | p | ) | − | 413 1000 | p | ( | 100 | − | p | ) |
| = | 413 10 | × | 100 | − | 413 10 | p | − | 413 1000 | p | ( | 100 | − | p | ) |
| = | 4130 | − | 413 10 | p | − | 413 1000 | p | ( | 100 | − | p | ) |
| = | 4130 | − | 413 10 | p | − | 413 1000 | p | × | 100 | + | 413 1000 | p | p |
| = | 4130 | − | 413 10 | p | − | 413 10 | p | + | 413 1000 | p | p |
| = | 4130 | − | 413 5 | p | + | 413 1000 | p | p |
| 100 | p | = | 4130 | − | 413 5 | p | + | 413 1000 | p | p |