2400 | ÷ | a | − | 50 | = | 400 | ÷ | a | + | 2000 | ÷ | ( | a | + | 2 | ) |
方程两边同时乘以: | a | , | ( | a | + | 2 | ) |
2400 | ( | a | + | 2 | ) | − | 50 | a | ( | a | + | 2 | ) | = | 400 | ÷ | 1 | × | 1 | ( | a | + | 2 | ) | + | 2000 | a |
2400 | a | + | 2400 | × | 2 | − | 50 | a | ( | a | + | 2 | ) | = | 400 | ÷ | 1 | × | 1 | ( | a | + | 2 | ) | + | 2000 | a |
2400 | a | + | 2400 | × | 2 | − | 50 | a | ( | a | + | 2 | ) | = | 400 | ÷ | 1 | × | 1 | a | + | 400 | ÷ | 1 | × | 1 | × | 2 | + | 2000 | a |
2400 | a | + | 4800 | − | 50 | a | ( | a | + | 2 | ) | = | 400 | a | + | 800 | + | 2000 | a |
2400 | a | + | 4800 | − | 50 | a | ( | a | + | 2 | ) | = | 2400 | a | + | 800 |
2400 | a | + | 4800 | − | 50 | a | a | − | 50 | a | × | 2 | = | 2400 | a | + | 800 |
2400 | a | + | 4800 | − | 50 | a | a | − | 100 | a | = | 2400 | a | + | 800 |
2300 | a | + | 4800 | − | 50 | a | a | = | 2400 | a | + | 800 |