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