题目内容
化简求值
÷(2+x-
),其中x=
-1.
| x |
| x-2 |
| 4 |
| 2-x |
| 2 |
原式=
÷(x+2+
),
=
÷
,
=
×
,
=
,
当x=
-1时,原式=
=
+1.
| x |
| x-2 |
| 4 |
| x-2 |
=
| x |
| x-2 |
| x2-4+4 |
| x-2 |
=
| x |
| x-2 |
| x-2 |
| x2 |
=
| 1 |
| x |
当x=
| 2 |
| 1 | ||
|
| 2 |
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