( | x | + | 98 | ) | ( | 42 | − | x | ) | ( | x | + | 98 | ) | = | 25 | × | 640 | × | 25 |
方程左边 = | x | ( | 42 | − | x | ) | ( | x | + | 98 | ) | + | 98 | ( | 42 | − | x | ) | ( | x | + | 98 | ) |
= | x | × | 42 | ( | x | + | 98 | ) | − | x | x | ( | x | + | 98 | ) | + | 98 | ( | 42 | − | x | ) | ( | x | + | 98 | ) |
= | x | × | 42 | x | + | x | × | 42 | × | 98 | − | x | x | ( | x | + | 98 | ) | + | 98 | ( | 42 | − | x | ) | ( | x | + | 98 | ) |
= | x | × | 42 | x | + | x | × | 4116 | − | x | x | ( | x | + | 98 | ) | + | 98 | ( | 42 | − | x | ) | ( | x | + | 98 | ) |
= | x | × | 42 | x | + | 4116 | x | − | x | x | x | − | x | x | × | 98 | + | 98 |
= | x | × | 42 | x | + | 4116 | x | − | x | x | x | − | x | x | × | 98 | + | 98 |
= | x | × | 42 | x | + | 4116 | x | − | x | x | x | − | x | x | × | 98 | + | 4116 |
= | x | × | 42 | x | + | 4116 | x | − | x | x | x | − | x | x | × | 98 | + | 4116 |
= | x | × | 42 | x | + | 4116 | x | − | x | x | x | − | x | x | × | 98 | + | 4116 |
= | x | × | 42 | x | + | 8232 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 |
= | x | × | 42 | x | + | 8232 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 |
= | x | × | 42 | x | + | 8232 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 |
= | x | × | 42 | x | − | 1372 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 |
x | × | 42 | x | − | 1372 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 | = | 25 | × | 640 | × | 25 |
方程右边 = | 400000 |
x | × | 42 | x | − | 1372 | x | − | x | x | x | − | x | x | × | 98 | + | 403368 | = | 400000 |
x1=2 |