( | x | × | 4 100 | + | x | ) | + | ( | 70 | − | x | ) | × | 40 100 | = | 518 5 |
方程左边 = | x | × | 4 100 | + | x | + | ( | 70 | − | x | ) | × | 40 100 |
= | 26 25 | x | + | ( | 70 | − | x | ) | × | 40 100 |
= | 26 25 | x | + | 70 | × | 40 100 | − | x | × | 40 100 |
= | 26 25 | x | + | 28 | − | x | × | 40 100 |
= | 16 25 | x | + | 28 |
16 25 | x | + | 28 | = | 518 5 |
16 25 | x | = | 518 5 | − | 28 |
16 25 | x | = | 378 5 |
x | = | 378 5 | ÷ | 16 25 |
= | 378 5 | × | 25 16 |
= | 189 | × | 5 8 |
x | = | 945 8 |
x | = | 118.125 |