问题 解答题
计算:
x2-2x+1
x2-x
÷
x2-1
2x
,其中x=-
3
2
答案

x2-2x+1
x2-x
÷
x2-1
2x

=

(x-1)2
x(x-1)
÷
(x-1)(x+1)
2x

=

x-1
x
×
2x
(x-1)(x+1)

=

2
x+1

当x=-

3
2
时,

原式=

2
-
3
2
+1
=-4.

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