问题
解答题
计算 (1)
(2)
|
答案
(1)原式=
-2x (x+2)(x-2) x+2 (x+2)(x-2)
=2x-x-2 (x+2)(x-2)
=
;1 x+2
(2)原式=
×a a-1
-a+1 a 1 a-1
=
-a+1 a-1 1 a-1
=
.a a-1
计算 (1)
(2)
|
(1)原式=
-2x (x+2)(x-2) x+2 (x+2)(x-2)
=2x-x-2 (x+2)(x-2)
=
;1 x+2
(2)原式=
×a a-1
-a+1 a 1 a-1
=
-a+1 a-1 1 a-1
=
.a a-1