xx-2-xx-2÷x-2x等于()A.0B.xx-2C.x2-4x(x-2)2D.-2x(x-2)2-数学

题目简介

xx-2-xx-2÷x-2x等于()A.0B.xx-2C.x2-4x(x-2)2D.-2x(x-2)2-数学

题目详情

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
题型:单选题难度:中档来源:不详

答案

class="stub"x
x-2
-class="stub"x
x-2
÷class="stub"x-2
x
=class="stub"x
x-2
-class="stub"x
x-2
•class="stub"x
x-2
=
x2-2x-x2
(x-2)2
=class="stub"-2x
(x-2)2
,故选D.

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