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