题目内容
化简
•
+
的结果是______．
| x2-1 |
| x2-2x+1 |
| x-1 |
| x2+x |
| 2 |
| x |
| x2-1 |
| x2-2x+1 |
| x-1 |
| x2+x |
| 2 |
| x |
=
| (x+1)(x-1) |
| (x-1)2 |
| x-1 |
| x(x+1) |
| 2 |
| x |
=
| 1 |
| x |
| 2 |
| x |
=
| 3 |
| x |
故答案为：
| 3 |
| x |
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故答案为：
题目内容
| x2-1 |
| x2-2x+1 |
| x-1 |
| x2+x |
| 2 |
| x |
| x2-1 |
| x2-2x+1 |
| x-1 |
| x2+x |
| 2 |
| x |
| (x+1)(x-1) |
| (x-1)2 |
| x-1 |
| x(x+1) |
| 2 |
| x |
| 1 |
| x |
| 2 |
| x |
| 3 |
| x |
| 3 |
| x |