问题 解答题
2
m2-4
-
1
2m-4
答案

原式=

2
(m+2)(m-2)
-
1
2(m-2)

=

4-(m+2)
2(m+2)(m-2)

=

-(m-2)
2(m+2)(m-2)

=-

1
2m+4

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