问题 解答题
化简:
(1)
2a
a2-4
+
1
2-a

(2)(
-a
b
)2÷(
2a2
5b
)2
a
5b
答案

(1)原式=

2a
(a+2)(a-2)
-
1
a-2
=
a-2
(a+2)(a-2)
=
1
a+2

(2)原式=

a2
b2
×
25b2
4a4
×
a
5b
=
5
4ab

解答题
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