问题
解答题
计算(1)
(2)5
|
答案
(1)
+12 m2-9 2 3-m
=
+12 (m+3)(m-3) 2 -(3-m) =
+12 (m+3)(m-3) -2(m+3) (m+3)(m-3) = 12-2(m+3) (m+3)(m-3) = -2(m-3) (m+3)(m-3) =- -2 (m+3)
(2)5
-912
+1 3 1 2
=1048
-33
+23 3
=93