问题
解答题
计算 (1)
(2)(
|
答案
(1)原式=
-2a (a+2)(a-2) a+2 (a+2)(a-2)
=
=2a-a-2 (a+2)(a-2) a-2 (a+2)(a-2)
=
;1 a+2
(2)原式=
•2x x-3
-x2-9 x
•x x+3 x2-9 x
=2(x+3)-(x-3)=x+9.
计算 (1)
(2)(
|
(1)原式=
-2a (a+2)(a-2) a+2 (a+2)(a-2)
=
=2a-a-2 (a+2)(a-2) a-2 (a+2)(a-2)
=
;1 a+2
(2)原式=
•2x x-3
-x2-9 x
•x x+3 x2-9 x
=2(x+3)-(x-3)=x+9.