x | × | 9 10 | + | ( | 5000 | − | x | ) | × | 21 100 | = | 5000 | × | 7 20 |
方程左边 = | 9 10 | x | + | 5000 | × | 21 100 | − | x | × | 21 100 |
= | 9 10 | x | + | 1050 | − | x | × | 21 100 |
= | 69 100 | x | + | 1050 |
69 100 | x | + | 1050 | = | 5000 | × | 7 20 |
方程右边 = | 1750 |
69 100 | x | + | 1050 | = | 1750 |
69 100 | x | = | 1750 | − | 1050 |
69 100 | x | = | 700 |
x | = | 700 | ÷ | 69 100 |
= | 700 | × | 100 69 |
x | = | 70000 69 |
x | = | 1014.492754 |