71 500 | = | x | × | 17 200 | + | 9 50 | ( | 1 | − | x | ) |
方程右边 = | 17 200 | x | + | 9 50 | × | 1 | − | 9 50 | x |
= | 17 200 | x | + | 9 50 | − | 9 50 | x |
= | - | 19 200 | x | + | 9 50 |
71 500 | = | - | 19 200 | x | + | 9 50 |
19 200 | x | = | 9 50 | − | 71 500 |
19 200 | x | = | 19 500 |
x | = | 19 500 | ÷ | 19 200 |
= | 19 500 | × | 200 19 |
= | 1 5 | × | 2 |
x | = | 2 5 |
x | = | 0.4 |