21 | ÷ | 63 | = | ( | 178 500 | − | X | ) | ÷ | ( | X | − | 71 500 | ) |
方程两边同时乘以: | ( | X | − | 71 500 | ) |
21 | ÷ | 63 | × | ( | X | − | 71 500 | ) | = | ( | 178 500 | − | X | ) |
21 | ÷ | 63 | × | X | − | 21 | ÷ | 63 | × | 71 500 | = | ( | 178 500 | − | X | ) |
21 | ÷ | 63 | × | X | − | 21 | ÷ | 63 | × | 71 500 | = | 178 500 | − | X |
1 3 | X | − | 71 1500 | = | 178 500 | − | X |
1 3 | X | + | X | = | 178 500 | + | 71 1500 |
4 3 | X | = | 178 500 | + | 71 1500 |
4 3 | X | = | 121 300 |
X | = | 121 300 | ÷ | 4 3 |
= | 121 300 | × | 3 4 |
= | 121 100 | × | 1 4 |
X | = | 121 400 |
X | = | 0.3025 |