题目内容
化简：
÷(x-
)，并求出当x=
-2时的值．
| x-1 |
| x |
| 1 |
| x |
| 3 |
原式=
÷
=
•
．
当x=
-2时，
原式=
=
．
| x-1 |
| x |
| (x2-1) |
| x |
=
| x-1 |
| x |
| x |
| (x+1)(x-1) |
| 1 |
| x+1 |
当x=
| 3 |
原式=
| 1 | ||
|
| ||
| 2 |
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题目内容
| x-1 |
| x |
| 1 |
| x |
| 3 |
| x-1 |
| x |
| (x2-1) |
| x |
| x-1 |
| x |
| x |
| (x+1)(x-1) |
| 1 |
| x+1 |
| 3 |
| 1 | ||
|
| ||
| 2 |