13 20 | ÷ | ( | 1 | + | 2 5 | x | ) | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | = | 1 |
| 方程两边同时乘以: | ( | 1 | + | 2 5 | x | ) |
13 20 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | × | ( | 1 | + | 2 5 | x | ) | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | = | 1 | ( | 1 | + | 2 5 | x | ) |
13 20 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | × | 1 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | × | 2 5 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | = | 1 | ( | 1 | + | 2 5 | x | ) |
13 20 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | × | 1 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | × | 2 5 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | = | 1 | × | 1 | + | 1 | × | 2 5 | x |
13 20 | + | 3 10 | ÷ | ( | 1 | − | 11 25 | x | ) | + | 3 25 | ÷ | ( | 1 | − | 11 25 | x | ) | × | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | = | 1 | + | 2 5 | x |
| 方程两边同时乘以: | ( | 1 | − | 11 25 | x | ) |
13 20 | ( | 1 | − | 11 25 | x | ) | + | 3 10 | + | 3 25 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | ( | 1 | − | 11 25 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) |
13 20 | × | 1 | − | 13 20 | × | 11 25 | x | + | 3 10 | + | 3 25 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | ( | 1 | − | 11 25 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) |
13 20 | × | 1 | − | 13 20 | × | 11 25 | x | + | 3 10 | + | 3 25 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | × | 1 | − | 1 | × | 11 25 | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) |
13 20 | − | 143 500 | x | + | 3 10 | + | 3 25 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | − | 11 25 | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) |
19 20 | − | 83 500 | x | + | 1 20 | ÷ | ( | 1 | + | 6 5 | x | ) | × | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | − | 11 25 | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) |
| 方程两边同时乘以: | ( | 1 | + | 6 5 | x | ) |
19 20 | ( | 1 | + | 6 5 | x | ) | − | 83 500 | x | ( | 1 | + | 6 5 | x | ) | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | ( | 1 | + | 6 5 | x | ) | − | 11 25 | x | ( | 1 | + | 6 5 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | × | 1 | + | 19 20 | × | 6 5 | x | − | 83 500 | x | ( | 1 | + | 6 5 | x | ) | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | ( | 1 | + | 6 5 | x | ) | − | 11 25 | x | ( | 1 | + | 6 5 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | × | 1 | + | 19 20 | × | 6 5 | x | − | 83 500 | x | ( | 1 | + | 6 5 | x | ) | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | × | 1 | + | 1 | × | 6 5 | x | − | 11 25 | x | ( | 1 | + | 6 5 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 57 50 | x | − | 83 500 | x | ( | 1 | + | 6 5 | x | ) | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | + | 6 5 | x | − | 11 25 | x | ( | 1 | + | 6 5 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 57 50 | x | − | 83 500 | x | × | 1 | − | 83 500 | x | × | 6 5 | x | + | 1 20 | ( | 1 | + | 2 5 | x | ) | = | 1 | + | 6 5 | x | − | 11 25 | x | ( | 1 | + | 6 5 | x | ) | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 57 50 | x | − | 83 500 | x | × | 1 | − | 83 500 | x | × | 6 5 | x | + | 1 20 | ( | 1 | + | 2 5 | x | ) | = | 1 | + | 6 5 | x | − | 11 25 | x | × | 1 | − | 11 25 | x | × | 6 5 | x | + | 2 5 | x |
19 20 | + | 57 50 | x | − | 83 500 | x | − | 249 1250 | x | x | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | + | 6 5 | x | − | 11 25 | x | − | 66 125 | x | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | ( | 1 | + | 2 5 | x | ) | ( | 1 | − | 11 25 | x | ) | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | × | 1 | ( | 1 | − | 11 25 | x | ) | + | 1 20 | × | 2 5 | x | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | ( | 1 | − | 11 25 | x | ) | ( | 1 | + | 6 5 | x | ) |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | × | 1 | ( | 1 | − | 11 25 | x | ) | + | 1 20 | × | 2 5 | x | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | × | 1 | ( | 1 | + | 6 5 | x | ) | − | 2 5 | x |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | ( | 1 | − | 11 25 | x | ) | + | 1 50 | x | ( | 1 | − | 11 25 | x | ) | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | ( | 1 | + | 6 5 | x | ) | − | 22 125 | x | x |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | × | 1 | − | 1 20 | × | 11 25 | x | + | 1 50 | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | ( | 1 | + | 6 5 | x | ) | − | 22 125 | x | x |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | × | 1 | − | 1 20 | × | 11 25 | x | + | 1 50 | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | × | 1 | + | 2 5 | x | × | 6 5 |
19 20 | + | 487 500 | x | − | 249 1250 | x | x | + | 1 20 | − | 11 500 | x | + | 1 50 | x | ( | 1 | − | 11 25 | x | ) | = | 1 | + | 19 25 | x | − | 66 125 | x | x | + | 2 5 | x | + | 12 25 | x | x | − | 22 125 |
| x1=0 |