( | 82 | − | 75 | ) | ÷ | ( | 75 | − | 61 | ) | = | ( | 85 | − | X | ) | ÷ | ( | X | − | 71 | ) |
方程两边同时乘以: | ( | 75 | − | 61 | ) | , | ( | X | − | 71 | ) |
( | 82 | − | 75 | ) | ( | X | − | 71 | ) | = | ( | 85 | − | X | ) | ( | 75 | − | 61 | ) |
82 | ( | X | − | 71 | ) | − | 75 | ( | X | − | 71 | ) | = | ( | 85 | − | X | ) | ( | 75 | − | 61 | ) |
82 | ( | X | − | 71 | ) | − | 75 | ( | X | − | 71 | ) | = | 85 | ( | 75 | − | 61 | ) | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 82 | × | 71 | − | 75 | ( | X | − | 71 | ) | = | 85 | ( | 75 | − | 61 | ) | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 82 | × | 71 | − | 75 | ( | X | − | 71 | ) | = | 85 | × | 75 | − | 85 | × | 61 | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 5822 | − | 75 | ( | X | − | 71 | ) | = | 6375 | − | 5185 | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 5822 | − | 75 | ( | X | − | 71 | ) | = | 1190 | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 5822 | − | 75 | X | + | 75 | × | 71 | = | 1190 | − | X | ( | 75 | − | 61 | ) |
82 | X | − | 5822 | − | 75 | X | + | 75 | × | 71 | = | 1190 | − | X | × | 75 | + | X | × | 61 |
82 | X | − | 5822 | − | 75 | X | + | 5325 | = | 1190 | − | X | × | 75 | + | X | × | 61 |
7 | X | − | 497 | = | 1190 | − | 14 | X |
7 | X | + | 14 | X | = | 1190 | + | 497 |
21 | X | = | 1190 | + | 497 |
21 | X | = | 1687 |
X | = | 1687 | ÷ | 21 |
= | 1687 | × | 1 21 |
= | 241 | × | 1 3 |
X | = | 241 3 |
X | = | 80.333333 |