问题 解答题
计算
(1)
x
x2-1
x+x2
x2
;                
(2)(
a+2
a-2
+
4
a2-4a+4
a
a-2
答案

(1)原式=

x
(x+1)(x-1)
×
x(x+1)
x2

=

1
x-1

(2)原式=

( a+2 )( a-2 )
( a-2 )2
+
4
( a-2 )2
]•
a-2
a

=

a2
( a-2 )2
a-2
a

=

a
a-2

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