题目内容
化简求值:
-
,其中a=
.
| a2-2a+1 |
| a2-1 |
| a |
| a+1 |
| 2 |
原式=
-
=
=-
;
当a=
时,
原式=-
=1-
.
| (a-1)2 |
| (a+1)(a-1) |
| a |
| a+1 |
=
| a-1-a |
| a+1 |
=-
| 1 |
| a+1 |
当a=
| 2 |
原式=-
| 1 | ||
|
| 2 |
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题目内容
| a2-2a+1 |
| a2-1 |
| a |
| a+1 |
| 2 |
| (a-1)2 |
| (a+1)(a-1) |
| a |
| a+1 |
| a-1-a |
| a+1 |
| 1 |
| a+1 |
| 2 |
| 1 | ||
|
| 2 |