题干
已知
=0,计算
·
的值.
| | |
| a |
| − |
| 2 |
| | |
| + |
| ( |
| b |
| − |
| 3 |
| ) |
| 2 |
| a |
| + |
| b |
| a |
| 2 |
| + |
| a |
| b |
| b |
| 2 |
| a |
| 2 |
| − |
| a |
| b |
| a |
| 2 |
| − |
| b |
| 2 |
答案(点此获取答案解析）
解:
·
| a |
| 2 |
| + |
| a |
| b |
| b |
| 2 |
（