14000 | ( | 1 | − | x | ) | ( | 1 | − | x | ) | = | 11340 |
方程左边 = | 14000 | × | 1 | ( | 1 | − | x | ) | − | 14000 | x | ( | 1 | − | x | ) |
= | 14000 | ( | 1 | − | x | ) | − | 14000 | x | ( | 1 | − | x | ) |
= | 14000 | × | 1 | − | 14000 | x | − | 14000 | x | ( | 1 | − | x | ) |
= | 14000 | − | 14000 | x | − | 14000 | x | ( | 1 | − | x | ) |
= | 14000 | − | 14000 | x | − | 14000 | x | × | 1 | + | 14000 | x | x |
= | 14000 | − | 14000 | x | − | 14000 | x | + | 14000 | x | x |
= | 14000 | − | 28000 | x | + | 14000 | x | x |
14000 | − | 28000 | x | + | 14000 | x | x | = | 11340 |
x1= | 1 10 |
x2= | 19 10 |