( | 460 | + | x | ) | ÷ | ( | 780 | + | x | ) | = | 60 100 |
方程两边同时乘以: | ( | 780 | + | x | ) |
( | 460 | + | x | ) | = | 60 100 | ( | 780 | + | x | ) |
460 | + | x | = | 60 100 | ( | 780 | + | x | ) |
460 | + | x | = | 60 100 | × | 780 | + | 60 100 | x |
460 | + | x | = | 468 | + | 60 100 | x |
x | − | 60 100 | x | = | 468 | − | 460 |
2 5 | x | = | 468 | − | 460 |
2 5 | x | = | 8 |
x | = | 8 | ÷ | 2 5 |
= | 8 | × | 5 2 |
= | 4 | × | 5 |
x | = | 20 |