题目内容
先化简,再求值:
÷(a-
),其中a=
.
| a+2 |
| a2 |
| 4 |
| a |
| 3 |
原式=
•
=
=
,
当a=
时,原式=
=
=-1-
.
| a+2 |
| a2 |
| a |
| (a+2)(a-2) |
| 1 |
| a(a-2) |
| 1 |
| a2-2a |
当a=
| 3 |
| 1 | ||
3-2
|
3+2
| ||
| -3 |
2
| ||
| 3 |
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题目内容
| a+2 |
| a2 |
| 4 |
| a |
| 3 |
| a+2 |
| a2 |
| a |
| (a+2)(a-2) |
| 1 |
| a(a-2) |
| 1 |
| a2-2a |
| 3 |
| 1 | ||
3-2
|
3+2
| ||
| -3 |
2
| ||
| 3 |