( | 28 | + | x | ) | ÷ | ( | 71 | + | x | ) | = | 3 5 |
方程两边同时乘以: | ( | 71 | + | x | ) |
( | 28 | + | x | ) | = | 3 5 | ( | 71 | + | x | ) |
28 | + | x | = | 3 5 | ( | 71 | + | x | ) |
28 | + | x | = | 3 5 | × | 71 | + | 3 5 | x |
28 | + | x | = | 213 5 | + | 3 5 | x |
x | − | 3 5 | x | = | 213 5 | − | 28 |
2 5 | x | = | 213 5 | − | 28 |
2 5 | x | = | 73 5 |
x | = | 73 5 | ÷ | 2 5 |
= | 73 5 | × | 5 2 |
= | 73 | × | 1 2 |
x | = | 73 2 |
x | = | 36.5 |