题目内容
计算:
-
=______.
| 1 |
| a-2 |
| 4 |
| a2-4 |
原式=
-
=
=
=
.故答案为
.
| a+2 |
| (a-2)(a+2) |
| 4 |
| a2-4 |
| a+2-4 |
| a2-4 |
| a-2 |
| (a-2)(a+2) |
| 1 |
| a+2 |
| 1 |
| a+2 |
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题目内容
| 1 |
| a-2 |
| 4 |
| a2-4 |
| a+2 |
| (a-2)(a+2) |
| 4 |
| a2-4 |
| a+2-4 |
| a2-4 |
| a-2 |
| (a-2)(a+2) |
| 1 |
| a+2 |
| 1 |
| a+2 |