( | 120 | − | 1 2 | x | ) | ÷ | ( | 3 2 | x | ) | + | 1 | ÷ | 3 | = | 120 | ÷ | x |
方程两边同时乘以: | ( | 3 2 | x | ) |
( | 120 | − | 1 2 | x | ) | + | 1 | ÷ | 3 | × | ( | 3 2 | x | ) | = | 120 | ÷ | 1 | × | ( | 3 2 | × | 1 | ) |
120 | − | 1 2 | x | + | 1 | ÷ | 3 | × | ( | 3 2 | x | ) | = | 120 | ÷ | 1 | × | ( | 3 2 | × | 1 | ) |
120 | − | 1 2 | x | + | 1 | ÷ | 3 | × | ( | 3 2 | x | ) | = | 120 | ÷ | 1 | × | 3 2 | × | 1 |
120 | − | 1 2 | x | + | 1 3 | ( | 3 2 | x | ) | = | 180 |
120 | − | 1 2 | x | + | 1 3 | × | 3 2 | x | = | 180 |
120 | − | 1 2 | x | + | 1 2 | x | = | 180 |
120 | − | 0 | x | = | 180 |
= | 180 | − | 120 |