4 | = | ( | x | ÷ | x | + | 1 | ) | + | ( | x | + | 1 | ÷ | x | + | 2 | ) | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | + | ( | x | + | 3 | ÷ | x | + | 4 | ) |
4 | = | x | ÷ | x | + | 1 | + | ( | x | + | 1 | ÷ | x | + | 2 | ) | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | + | ( | x | + | 3 | ÷ | x | + | 4 | ) |
4 | = | 1 | ÷ | 1 | + | 1 | + | x | + | 1 | ÷ | x | + | 2 | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | + | ( | x | + | 3 | ÷ | x | + | 4 | ) |
4 | = | 1 | + | 1 | + | x | + | 1 | ÷ | x | + | 2 | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | + | ( | x | + | 3 | ÷ | x | + | 4 | ) |
4 | = | 4 | + | x | + | 1 | ÷ | x | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | + | ( | x | + | 3 | ÷ | x | + | 4 | ) |
方程两边同时乘以: | x |
4 | x | = | 4 | x | + | x | x | + | 1 | + | ( | x | + | 2 | ÷ | x | + | 3 | ) | x | + | ( | x | + | 3 | ÷ | x | + | 4 | ) | x |
4 | x | = | 4 | x | + | x | x | + | 1 | + | x | x | + | 2 | ÷ | x | × | x | + | 3 | x |
4 | x | = | 7 | x | + | x | x | + | 1 | + | x | x | + | 2 | ÷ | x | × | x | + | ( | x | + | 3 | ÷ | x | + | 4 | ) | x |
4 | x | = | 7 | x | + | x | x | + | 1 | + | x | x | + | 2 | ÷ | 1 | × | 1 | + | x | x |
4 | x | = | 7 | x | + | x | x | + | 1 | + | x | x | + | 2 | + | x | x | + | 3 | ÷ | x |
4 | x | = | 11 | x | + | x | x | + | 3 | + | x | x | + | x | x | + | 3 | ÷ | x | × | x |