题目内容
化简
+
的结果为______；化简
的结果是______．
| x |
| x-1 |
| 1 |
| 1-x |
| a2+2a |
| a |
| x |
| x-1 |
| 1 |
| 1-x |
=
| x |
| x-1 |
| 1 |
| x-1 |
=
| x-1 |
| x-1 |
=1；
| a2+2a |
| a |
| a(a+2) |
| a |
故答案为：1；a+2．
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=
=
=1；
故答案为：1；a+2．
题目内容
| x |
| x-1 |
| 1 |
| 1-x |
| a2+2a |
| a |
| x |
| x-1 |
| 1 |
| 1-x |
| x |
| x-1 |
| 1 |
| x-1 |
| x-1 |
| x-1 |
| a2+2a |
| a |
| a(a+2) |
| a |