750 | ( | 200 | + | 2000 | ) | ÷ | ( | 200 | − | x | ) | + | x | = | 2750 |
方程两边同时乘以: | ( | 200 | − | x | ) |
750 | ( | 200 | + | 2000 | ) | + | x | ( | 200 | − | x | ) | = | 2750 | ( | 200 | − | x | ) |
750 | × | 200 | + | 750 | × | 2000 | + | x | ( | 200 | − | x | ) | = | 2750 | ( | 200 | − | x | ) |
750 | × | 200 | + | 750 | × | 2000 | + | x | ( | 200 | − | x | ) | = | 2750 | × | 200 | − | 2750 | x |
150000 | + | 1500000 | + | x | ( | 200 | − | x | ) | = | 550000 | − | 2750 | x |
1650000 | + | x | ( | 200 | − | x | ) | = | 550000 | − | 2750 | x |
1650000 | + | x | × | 200 | − | x | x | = | 550000 | − | 2750 | x |