问题 解答题
化简:(
x2-4
x2-4x+4
-
1
x-2
x+1
x2-2x
答案

原式=[

(x+2)(x-2)
(x-2)2
-
1
x-2
x+1
x(x-2)
=
x+2-1
x-2
x(x-2)
x+1
=
x+1
x-2
x(x-2)
x+1
=x.

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