题目内容
先化简,再求值:
+
,其中x=
-1.
| x2-2x+1 |
| x2-x |
| 2 |
| x |
| 2 |
原式=
+
=
+
=
,
当x=
-1时,原式=
=
(
+1)=2+
.
| (x-1)2 |
| x(x-1) |
| 2 |
| x |
=
| x-1 |
| x |
| 2 |
| x |
=
| x+1 |
| x |
当x=
| 2 |
| ||
|
| 2 |
| 2 |
| 2 |
练习册系列答案
相关题目
题目内容
| x2-2x+1 |
| x2-x |
| 2 |
| x |
| 2 |
| (x-1)2 |
| x(x-1) |
| 2 |
| x |
| x-1 |
| x |
| 2 |
| x |
| x+1 |
| x |
| 2 |
| ||
|
| 2 |
| 2 |
| 2 |