题目内容
先化简,再求值:
-
+
,其中x=
+2.
x2 |
x-2 |
4x |
x-2 |
4 |
x-2 |
2 |
原式=
=
=x-2,
当x=
+2时,原式=
.
x2-4x+4 |
x-2 |
=
(x-2)2 |
x-2 |
=x-2,
当x=
2 |
2 |
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题目内容
x2 |
x-2 |
4x |
x-2 |
4 |
x-2 |
2 |
x2-4x+4 |
x-2 |
(x-2)2 |
x-2 |
2 |
2 |