题目内容
当x=
时，求
•
的值．
| 1 |
| 2 |
| x2-1 |
| x2+2x+1 |
| 1 |
| 2x-2 |
原式=
•
=
，
当x=
时，原式=
=
．
| x-1 |
| x+1 |
| 1 |
| 2(x-1) |
=
| 1 |
| 2(x+1) |
当x=
| 1 |
| 2 |
| 1 | ||
2(
|
| 1 |
| 3 |
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题目内容
| 1 |
| 2 |
| x2-1 |
| x2+2x+1 |
| 1 |
| 2x-2 |
| x-1 |
| x+1 |
| 1 |
| 2(x-1) |
| 1 |
| 2(x+1) |
| 1 |
| 2 |
| 1 | ||
2(
|
| 1 |
| 3 |