( | 3400 | × | 9000 | + | 4500 | x | ) | ÷ | ( | 9000 | + | x | ) | = | 4000 |
方程两边同时乘以: | ( | 9000 | + | x | ) |
( | 3400 | × | 9000 | + | 4500 | x | ) | = | 4000 | ( | 9000 | + | x | ) |
3400 | × | 9000 | + | 4500 | x | = | 4000 | ( | 9000 | + | x | ) |
3400 | × | 9000 | + | 4500 | x | = | 4000 | × | 9000 | + | 4000 | x |
30600000 | + | 4500 | x | = | 36000000 | + | 4000 | x |
4500 | x | − | 4000 | x | = | 36000000 | − | 30600000 |
500 | x | = | 36000000 | − | 30600000 |
500 | x | = | 5400000 |
x | = | 5400000 | ÷ | 500 |
= | 5400000 | × | 1 500 |
= | 10800 | × | 1 |
x | = | 10800 |