问题
解答题
先化简，再求值：1-
|
答案
原式=1-
| a-1 |
| a |
| a2-1 |
| a(a+2) |
=1-
| a-1 |
| a |
| a(a+2) |
| (a+1)(a-1) |
=1-
| a+2 |
| a+1 |
=
| a+1-(a+2) |
| a+1 |
=
| a+1-a-2 |
| a+1 |
=-
| 1 |
| a+1 |
原式=-
| 1 | ||
|
| 1 | ||
|
| ||
| 2 |
搜题请搜索小程序“爱下问搜题”
先化简，再求值：1-
|
原式=1-
| a-1 |
| a |
| a2-1 |
| a(a+2) |
=1-
| a-1 |
| a |
| a(a+2) |
| (a+1)(a-1) |
=1-
| a+2 |
| a+1 |
=
| a+1-(a+2) |
| a+1 |
=
| a+1-a-2 |
| a+1 |
=-
| 1 |
| a+1 |
原式=-
| 1 | ||
|
| 1 | ||
|
| ||
| 2 |