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计算：
12
m2-9
+
2
3-m
+
2
m+3
．
人气：443 ℃　时间：2020-06-25 19:42:03
解答
12
m2-9
+
2
3-m
+
2
m+3

=
12
(m+3)(m-3)
+
-2(m+3)
(m+3)(m-3)
+
2(m-3)
(m+3)(m-3)

=
12-2(m+3)+2(m-3)
(m+3)(m-3)

=
12-2m-6+2m-6
(m+3)(m-3)

=0
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