题目内容
先化简后求值:(1+
)÷(
-
),其中a=
.
| 1 |
| a-1 |
| a |
| a2-1 |
| a |
| a+1 |
| 1 |
| 4 |
原式=
÷
=
•
=
,
当a=
时,原式=
=
.
| a-1+1 |
| a-1 |
| a-a(a-1) |
| (a+1)(a-1) |
| a |
| a-1 |
| (a+1)(a-1) |
| -a(a-2) |
| a+1 |
| 2-a |
当a=
| 1 |
| 4 |
| ||
2-
|
| 5 |
| 7 |
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