( | 10 | x | − | 245 4 | ) | × | 89 4 | − | ( | 245 2 | + | 5 | x | ) | ( | x | − | 5 | ) | = | 0 |
方程左边 = | 10 | x | × | 89 4 | − | 245 4 | × | 89 4 | − | ( | 245 2 | + | 5 | x | ) | ( | x | − | 5 | ) |
= | 445 2 | x | − | 21805 16 | − | ( | 245 2 | + | 5 | x | ) | ( | x | − | 5 | ) |
= | 445 2 | x | − | 21805 16 | − | 245 2 | ( | x | − | 5 | ) | − | 5 | x | ( | x | − | 5 | ) |
= | 445 2 | x | − | 21805 16 | − | 245 2 | x | + | 245 2 | × | 5 | − | 5 | x | ( | x | − | 5 | ) |
= | 445 2 | x | − | 21805 16 | − | 245 2 | x | + | 1225 2 | − | 5 | x | ( | x | − | 5 | ) |
= | 100 | x | − | 12005 16 | − | 5 | x | ( | x | − | 5 | ) |
= | 100 | x | − | 12005 16 | − | 5 | x | x | + | 5 | x | × | 5 |
= | 100 | x | − | 12005 16 | − | 5 | x | x | + | 25 | x |
= | 125 | x | − | 12005 16 | − | 5 | x | x |
125 | x | − | 12005 16 | − | 5 | x | x | = | 0 |