| 1 | ÷ | n | + | 1 | ÷ | ( | n | + | 1 | ) | + | 1 | ÷ | ( | n | + | 2 | ) | = | 107 | ÷ | 210 |
| 方程两边同时乘以: | n |
| 1 | + | 1 | ÷ | ( | n | + | 1 | ) | × | n | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | = | 107 | ÷ | 210 | × | n |
| 方程两边同时乘以: | ( | n | + | 1 | ) |
| 1 | ( | n | + | 1 | ) | + | 1 | n | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | ( | n | + | 1 | ) | = | 107 | ÷ | 210 | × | n | ( | n | + | 1 | ) |
| 1 | n | + | 1 | × | 1 | + | 1 | n | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | ( | n | + | 1 | ) | = | 107 | ÷ | 210 | × | n | ( | n | + | 1 | ) |
| 1 | n | + | 1 | × | 1 | + | 1 | n | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | ( | n | + | 1 | ) | = | 107 | ÷ | 210 | × | n | n | + | 107 | ÷ | 210 | × | n | × | 1 |
| 1 | n | + | 1 | + | 1 | n | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | ( | n | + | 1 | ) | = | 107 210 | n | n | + | 107 210 | n |
| 2 | n | + | 1 | + | 1 | ÷ | ( | n | + | 2 | ) | × | n | ( | n | + | 1 | ) | = | 107 210 | n | n | + | 107 210 | n |
| 方程两边同时乘以: | ( | n | + | 2 | ) |
| 2 | n | ( | n | + | 2 | ) | + | 1 | ( | n | + | 2 | ) | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | ( | n | + | 2 | ) | + | 107 210 | n | ( | n | + | 2 | ) |
| 2 | n | n | + | 2 | n | × | 2 | + | 1 | ( | n | + | 2 | ) | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | ( | n | + | 2 | ) | + | 107 210 | n | ( | n | + | 2 | ) |
| 2 | n | n | + | 2 | n | × | 2 | + | 1 | ( | n | + | 2 | ) | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 210 | n | n | × | 2 | + | 107 210 | n | ( | n | + | 2 | ) |
| 2 | n | n | + | 4 | n | + | 1 | ( | n | + | 2 | ) | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | ( | n | + | 2 | ) |
| 2 | n | n | + | 4 | n | + | 1 | n | + | 1 | × | 2 | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | ( | n | + | 2 | ) |
| 2 | n | n | + | 4 | n | + | 1 | n | + | 1 | × | 2 | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 210 | n |
| 2 | n | n | + | 4 | n | + | 1 | n | + | 2 | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 105 | n |
| 2 | n | n | + | 5 | n | + | 2 | + | 1 | n | ( | n | + | 1 | ) | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 105 | n |
| 2 | n | n | + | 5 | n | + | 2 | + | 1 | n | n | + | 1 | n | × | 1 | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 105 | n |
| 2 | n | n | + | 5 | n | + | 2 | + | 1 | n | n | + | 1 | n | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 105 | n |
| 2 | n | n | + | 6 | n | + | 2 | + | 1 | n | n | = | 107 210 | n | n | n | + | 107 105 | n | n | + | 107 210 | n | n | + | 107 105 | n |
| n1=5 |