300 | ÷ | ( | 1 | + | 1 5 | ) | + | 400 | ÷ | x | = | 260 |
方程两边同时乘以: | ( | 1 | + | 1 5 | ) |
300 | + | 400 | ÷ | x | × | ( | 1 | + | 1 5 | ) | = | 260 | ( | 1 | + | 1 5 | ) |
300 | + | 400 | ÷ | x | × | 1 | + | 400 | ÷ | x | × | 1 5 | = | 260 | ( | 1 | + | 1 5 | ) |
300 | + | 400 | ÷ | x | × | 1 | + | 400 | ÷ | x | × | 1 5 | = | 260 | × | 1 | + | 260 | × | 1 5 |
300 | + | 400 | ÷ | x | + | 80 | ÷ | x | = | 260 | + | 52 |
300 | + | 400 | ÷ | x | + | 80 | ÷ | x | = | 312 |
方程两边同时乘以: | x |
300 | x | + | 400 | + | 80 | ÷ | 1 | × | 1 | = | 312 | x |
300 | x | − | 312 | x | = | - | 400 | − | 80 | ÷ | 1 | × | 1 |
300 | x | − | 312 | x | = | - | 400 | − | 80 |
- | 12 | x | = | - | 400 | − | 80 |
- | 12 | x | = | - | 480 |
480 | = | 12 | x |
12 | x | = | 480 |
x | = | 480 | ÷ | 12 |
= | 480 | × | 1 12 |
= | 40 | × | 1 |
x | = | 40 |