题目内容
计算：
-m-3=______．
| m2 |
| m-3 |
原式=
-
=
=
．
故答案为：
| m2 |
| m-3 |
| (m-3)(m+3) |
| m-3 |
| m2-(m2-9) |
| m-3 |
| 9 |
| m-3 |
故答案为：
| 9 |
| m-3 |
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题目内容
| m2 |
| m-3 |
| m2 |
| m-3 |
| (m-3)(m+3) |
| m-3 |
| m2-(m2-9) |
| m-3 |
| 9 |
| m-3 |
| 9 |
| m-3 |