题目内容
化简求值
÷(
-x-2),其中x=
-1.
| 2x-6 |
| x-2 |
| 5 |
| x-2 |
| 2 |
原式=
÷
=
×
=-
,
当x=
-1时,原式=-
=
-2.
| 2(x-3) |
| x-2 |
| 9-x2 |
| x-2 |
=
| 2(x-3) |
| x-2 |
| x-2 |
| -(x+3)(x-3) |
=-
| 2 |
| x+3 |
当x=
| 2 |
| 2 | ||
|
| 2 |
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