问题 解答题
计算:
(1)(
x2-4x+4
x2-4
-
x
x+2
x-1
x+2
;  
(2)(1+
1
x
)•
x2-2x+1
x2-1
答案

(1)原式=

x-2-x
x+2
x+2
x-1

=

-2
x+2
x+2
x-1

=

2
1-x

(2)原式=

x+1
x
x-1
x+1

=

x-1
x

解答题
问答题 简答题