问题
解答题
化简求值：
|
答案
原式=
| (a+1)(a-1) |
| (a-1)2 |
| a(a-2) |
| a-2 |
| 1 |
| a |
=
| a+1 |
| a-1 |
=
| a+1-a+1 |
| a-1 |
=
| 2 |
| a-1 |
当a=
| 2 |
原式=
| 2 | ||
|
| 2 |
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化简求值：
|
原式=
| (a+1)(a-1) |
| (a-1)2 |
| a(a-2) |
| a-2 |
| 1 |
| a |
=
| a+1 |
| a-1 |
=
| a+1-a+1 |
| a-1 |
=
| 2 |
| a-1 |
当a=
| 2 |
原式=
| 2 | ||
|
| 2 |