情形2 |
|
|
|
|
|
|
|
| 0.500 | 0.500 | 0.500 |
| 1.750 | 1.667 | 1.625 |
情形3 |
|
|
|
|
|
|
|
| 2 | 2 | 2 |
| 4 | 4 | 4 |