( | 300 | ÷ | x | − | 1 | ) | ( | x | + | 10 | ) | = | 300 |
300 | ÷ | x | × | ( | x | + | 10 | ) | − | 1 | ( | x | + | 10 | ) | = | 300 |
方程两边同时乘以: | x |
300 | ( | x | + | 10 | ) | − | 1 | ( | x | + | 10 | ) | x | = | 300 | x |
300 | x | + | 300 | × | 10 | − | 1 | ( | x | + | 10 | ) | x | = | 300 | x |
300 | x | + | 3000 | − | 1 | ( | x | + | 10 | ) | x | = | 300 | x |
300 | x | + | 3000 | − | 1 | x | x | − | 1 | × | 10 | x | = | 300 | x |
300 | x | + | 3000 | − | 1 | x | x | − | 10 | x | = | 300 | x |
290 | x | + | 3000 | − | 1 | x | x | = | 300 | x |