( | x | − | x | ÷ | 40 | ) | + | ( | x | − | 3870 | ) | = | x | ÷ | 19 20 |
方程左边 = | x | − | x | ÷ | 40 | + | ( | x | − | 3870 | ) |
= | 39 40 | x | + | ( | x | − | 3870 | ) |
= | 39 40 | x | + | x | − | 3870 |
= | 79 40 | x | − | 3870 |
79 40 | x | − | 3870 | = | x | ÷ | 19 20 |
79 40 | x | − | 20 19 | x | = | 3870 |
701 760 | x | = | 3870 |
x | = | 3870 | ÷ | 701 760 |
= | 3870 | × | 760 701 |
x | = | 2941200 701 |
x | = | 4195.720399 |