| ( | 2 5 | + | 2 | x | ) | ( | 2 5 | + | 2 | x | ) | ÷ | ( | 1 | − | x | ) | = | 9 10 |
| 方程两边同时乘以: | ( | 1 | − | x | ) |
| ( | 2 5 | + | 2 | x | ) | ( | 2 5 | + | 2 | x | ) | = | 9 10 | ( | 1 | − | x | ) |
2 5 | ( | 2 5 | + | 2 | x | ) | + | 2 | x | ( | 2 5 | + | 2 | x | ) | = | 9 10 | ( | 1 | − | x | ) |
2 5 | ( | 2 5 | + | 2 | x | ) | + | 2 | x | ( | 2 5 | + | 2 | x | ) | = | 9 10 | × | 1 | − | 9 10 | x |
2 5 | ( | 2 5 | + | 2 | x | ) | + | 2 | x | ( | 2 5 | + | 2 | x | ) | = | 9 10 | − | 9 10 | x |
2 5 | × | 2 5 | + | 2 5 | × | 2 | x | + | 2 | x | ( | 2 5 | + | 2 | x | ) | = | 9 10 | − | 9 10 | x |
4 25 | + | 4 5 | x | + | 2 | x | ( | 2 5 | + | 2 | x | ) | = | 9 10 | − | 9 10 | x |
4 25 | + | 4 5 | x | + | 2 | x | × | 2 5 | + | 2 | x | × | 2 | x | = | 9 10 | − | 9 10 | x |
4 25 | + | 4 5 | x | + | 4 5 | x | + | 4 | x | x | = | 9 10 | − | 9 10 | x |
4 25 | + | 8 5 | x | + | 4 | x | x | = | 9 10 | − | 9 10 | x |