题干
化简：
﹣
．
| 5 |
| a |
| + |
| 3 |
| b |
| a |
| 2 |
| b |
| 2 |
| 2 |
| a |
| a |
| 2 |
| b |
| 2 |
答案(点此获取答案解析）
解：
{#/mat
| 5 |
| a |
| + |
| 3 |
| b |
| a |
| 2 |
| − |
| b |
| 2 |
