( | k | + | 1 | ) | ( | k | + | 1 | ) | − | 2 | ( | k | − | 3 | ) | = | 23 |
方程左边 = | k | ( | k | + | 1 | ) | + | 1 | ( | k | + | 1 | ) | − | 2 | ( | k | − | 3 | ) |
= | k | k | + | k | × | 1 | + | 1 | ( | k | + | 1 | ) | − | 2 | ( | k | − | 3 | ) |
= | k | k | + | 1 | k | + | 1 | k | + | 1 | × | 1 | − | 2 | ( | k | − | 3 | ) |
= | k | k | + | 1 | k | + | 1 | k | + | 1 | − | 2 | ( | k | − | 3 | ) |
= | k | k | + | 2 | k | + | 1 | − | 2 | ( | k | − | 3 | ) |
= | k | k | + | 2 | k | + | 1 | − | 2 | k | + | 2 | × | 3 |
= | k | k | + | 2 | k | + | 1 | − | 2 | k | + | 6 |
= | k | k | + | 0 | k | + | 7 |
k | k | + | 7 | = | 23 |