题干
不改变分式的值，化简：
=____ ．
| - |
| 0 |
| . |
| + |
| 0 |
| . |
| 1 |
| - |
| 0 |
| . |
| - |
| 0 |
| . |
答案(点此获取答案解析）
| 3 |
| x |
| - |
| 4 |
| x |
| + |
| 3 |
| - |
| 0 |
| . |
| + |
| 0 |
| . |
| 1 |
| - |
| 0 |
| . |
| - |
| 0 |
| . |
| 3 |
| x |
| - |
| 4 |
| x |
| + |
| 3 |
