题目内容
先化简,再求值:
-
÷
,其中x=
-2.
| x |
| x+2 |
| x2+2x+1 |
| x+2 |
| x2-1 |
| x-1 |
| 3 |
原式=
-
•
,
=
-
,
=
;
将x=
-2代入,得:原式=
=-
.
| x |
| x+2 |
| (x+1)2 |
| x+2 |
| x-1 |
| (x+1)(x-1) |
=
| x |
| x+2 |
| x+1 |
| x+2 |
=
| -1 |
| x+2 |
将x=
| 3 |
| -1 | ||
|
| ||
| 3 |
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