t | ( | t | + | 1 | ) | ( | 1 2 | t | + | 1 | ) | = | 25 |
方程左边 = | t | t | ( | 1 2 | t | + | 1 | ) | + | t | × | 1 | ( | 1 2 | t | + | 1 | ) |
= | t | t | × | 1 2 | t | + | t | t | × | 1 | + | t | × | 1 | ( | 1 2 | t | + | 1 | ) |
= | t | t | × | 1 2 | t | + | t | t | × | 1 | + | t | × | 1 | × | 1 2 | t | + | t |
= | t | t | × | 1 2 | t | + | t | t | × | 1 | + | t | × | 1 2 | t | + | t | × | 1 |
t | t | × | 1 2 | t | + | t | t | × | 1 | + | t | × | 1 2 | t | + | 1 | t | = | 25 |