( | X | − | 120 | ) | ÷ | X | × | ( | X | − | 80 | ) | = | 24 100 | X |
方程两边同时乘以: | X |
( | X | − | 120 | ) | ( | X | − | 80 | ) | = | 24 100 | X | X |
X | ( | X | − | 80 | ) | − | 120 | ( | X | − | 80 | ) | = | 24 100 | X | X |
X | X | − | X | × | 80 | − | 120 | ( | X | − | 80 | ) | = | 24 100 | X | X |
X | X | − | 80 | X | − | 120 | X | + | 120 | × | 80 | = | 24 100 | X | X |
X | X | − | 80 | X | − | 120 | X | + | 9600 | = | 24 100 | X | X |
X | X | − | 200 | X | + | 9600 | = | 24 100 | X | X |