| ( | 1 | − | t | ) | ( | t | + | 1 | ÷ | 2019 | ) | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t | = | 0 |
| 方程左边 = | 1 | ( | t | + | 1 | ÷ | 2019 | ) | − | t | ( | t | + | 1 | ÷ | 2019 | ) | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 1 | t | + | 1 | × | 1 | ÷ | 2019 | − | t | ( | t | + | 1 | ÷ | 2019 | ) | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 1 | t | + | 1 2019 | − | t | ( | t | + | 1 | ÷ | 2019 | ) | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 1 | t | + | 1 2019 | − | t | t | − | t | × | 1 | ÷ | 2019 | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 1 | t | + | 1 2019 | − | t | t | − | t | × | 1 2019 | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 2018 2019 | t | + | 1 2019 | − | t | t | − | ( | 1 | − | t | − | 1 | ÷ | 2019 | ) | t |
| = | 2018 2019 | t | + | 1 2019 | − | t | t | − | 1 | t | + | t | t | + | 1 | ÷ | 2019 | × | t |
| = | 2018 2019 | t | + | 1 2019 | − | t | t | − | 1 | t | + | t | t | + | 1 2019 | t |
| = | - | 0 | t | + | 1 2019 | − | t | t | + | t | t |
1 2019 | − | t | t | + | t | t | = | 0 |