1 | ÷ | 2 | = | ( | 85 | − | a | ) | ÷ | ( | a | − | 71 | ) |
方程两边同时乘以: | ( | a | − | 71 | ) |
1 | ÷ | 2 | × | ( | a | − | 71 | ) | = | ( | 85 | − | a | ) |
1 | ÷ | 2 | × | a | − | 1 | ÷ | 2 | × | 71 | = | ( | 85 | − | a | ) |
1 | ÷ | 2 | × | a | − | 1 | ÷ | 2 | × | 71 | = | 85 | − | a |
1 2 | a | − | 71 2 | = | 85 | − | a |
1 2 | a | + | a | = | 85 | + | 71 2 |
3 2 | a | = | 85 | + | 71 2 |
3 2 | a | = | 241 2 |
a | = | 241 2 | ÷ | 3 2 |
= | 241 2 | × | 2 3 |
= | 241 | × | 1 3 |
a | = | 241 3 |
a | = | 80.333333 |