12 | × | 6 | − | 2 | t | × | 6 | ÷ | 2 | − | ( | 12 | − | 2 | t | ) | t | ÷ | 2 | − | ( | 6 | − | t | ) | × | 12 | ÷ | 2 | = | 22 |
方程左边 = | 72 | − | 6 | t | − | ( | 12 | − | 2 | t | ) | t | × | 1 2 | − | ( | 6 | − | t | ) | × | 6 |
72 | − | 6 | t | − | ( | 12 | − | 2 | t | ) | t | × | 1 2 | − | ( | 6 | − | t | ) | × | 6 | = | 22 |
方程左边 = | 72 | − | 6 | t | − | 12 | t | × | 1 2 | + | 2 | t | t | × | 1 2 | − | ( | 6 | − | t | ) | × | 6 |
= | 72 | − | 6 | t | − | 6 | t | + | 1 | t | t | − | ( | 6 | − | t | ) | × | 6 |
= | 72 | − | 12 | t | + | 1 | t | t | − | ( | 6 | − | t | ) | × | 6 |
= | 72 | − | 12 | t | + | 1 | t | t | − | 6 | × | 6 | + | t | × | 6 |
= | 72 | − | 12 | t | + | 1 | t | t | − | 36 | + | t | × | 6 |
= | 36 | − | 6 | t | + | 1 | t | t |
36 | − | 6 | t | + | 1 | t | t | = | 22 |