问题 解答题
先化简,再求值:(
x2-4
x2-4x+4
-
x-2
x+2
x
x-2
,其中x=2
3
-2
答案

x2-4
x2-4x+4
-
x-2
x+2
)÷
x
x-2

=(

(x+2)(x-2)
(x-2)2
-
x-2
x+2
)×
x-2
x

=(

x+2
x-2
-
x-2
x+2
)×
x-2
x

=

x2+4x+4-x2+4x-4
(x-2)(x+2)
×
x-2
x

=

8x
(x-2)(x+2)
×
x-2
x

=

8
x+2

当x=2

3
-2时,原式=
8
2
3
-2+2
=
4
3
3

选择题
多项选择题