问题 选择题
x
x-2
-
x
x-2
÷
x-2
x
等于(  )
A.0B.
x
x-2
C.
x2-4x
(x-2)2
D.
-2x
(x-2)2
答案

x
x-2
-
x
x-2
÷
x-2
x
=
x
x-2
-
x
x-2
x
x-2
=
x2-2x-x2
(x-2)2
=
-2x
(x-2)2
,故选D.

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