80 | x | x | − | 71 | ( | x | − | 12 | ) | ( | x | − | 12 | ) | − | 6667 1000 | × | 3917 | ( | 2233 20 | − | x | ) | = | 0 |
方程左边 = | 80 | x | x | − | 71 | ( | x | − | 12 | ) | ( | x | − | 12 | ) | − | 26114639 1000 | ( | 2233 20 | − | x | ) |
80 | x | x | − | 71 | ( | x | − | 12 | ) | ( | x | − | 12 | ) | − | 26114639 1000 | ( | 2233 20 | − | x | ) | = | 0 |
方程左边 = | 80 | x | x | − | 71 | x | ( | x | − | 12 | ) | + | 71 | × | 12 | ( | x | − | 12 | ) | − | 26114639 1000 | ( | 2233 20 | − | x | ) |
= | 80 | x | x | − | 71 | x | ( | x | − | 12 | ) | + | 852 | ( | x | − | 12 | ) | − | 26114639 1000 | ( | 2233 20 | − | x | ) |
= | 80 | x | x | − | 71 | x | x | + | 71 | x | × | 12 | + | 852 | ( | x | − | 12 | ) | − | 26114639 1000 |
= | 80 | x | x | − | 71 | x | x | + | 852 | x | + | 852 | ( | x | − | 12 | ) | − | 26114639 1000 | ( | 2233 20 | − | x | ) |
= | 80 | x | x | − | 71 | x | x | + | 852 | x | + | 852 | x | − | 852 | × | 12 |
= | 80 | x | x | − | 71 | x | x | + | 852 | x | + | 852 | x | − | 10224 | − | 26114639 1000 |
= | 80 | x | x | − | 71 | x | x | + | 1704 | x | − | 10224 | − | 26114639 1000 | ( | 2233 20 | − | x | ) |
= | 80 | x | x | − | 71 | x | x | + | 1704 | x | − | 10224 | − | 26114639 1000 | × | 2233 20 | + | 26114639 1000 |