问题
解答题
(1)计算:
(3)计算:
|
答案
(1)原式=2
+4-1=23
+3;3
(2)原式=
-2a (a+3)(a-3) 1 a-3
=
-2a (a+3)(a-3) a+3 (a+3)(a-3)
=a-3 (a+3)(a-3)
=
.1 a+3
(1)计算:
(3)计算:
|
(1)原式=2
+4-1=23
+3;3
(2)原式=
-2a (a+3)(a-3) 1 a-3
=
-2a (a+3)(a-3) a+3 (a+3)(a-3)
=a-3 (a+3)(a-3)
=
.1 a+3