问题 填空题
计算
3
2a-4
-
4
a2-4
=______.
答案

原式=

3
2(a-2)
-
4
(a+2)(a-2)

=

3(a+2)-8
2(a+2)(a-2)

=

3a-2
2(a+2)(a-2)

故答案为:

3a-2
2(a+2)(a-2)

判断题
填空题