题目内容
先化简,再求值:
÷
-
,其中x=
.
| x2-x-6 |
| x2-x-2 |
| x+2 |
| x+1 |
| x |
| x-2 |
| 1 | ||
2-
|
原式=
•
-
=
-
=
,
当x=
=2+
时,
原式=
=-
.
| (x+2)(x-3) |
| (x+1)(x-2) |
| x+1 |
| x+2 |
| x |
| x-2 |
=
| x-3 |
| x-2 |
| x |
| x-2 |
=
| -3 |
| x-2 |
当x=
| 1 | ||
2-
|
| 3 |
原式=
| -3 | ||
2+
|
| 3 |
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