问题
解答题
计算或化简 (1)(
(2)
|
答案
(1)原式=
÷x2 (x-2)2 x x-2
=
;x x-2
(2)原式=
-x2 2-x 4 2-x
=x2-4 2-x
=(x+2)(x-2) 2-x
=-x-2
当x=
-2时,原式=-3
.3
计算或化简 (1)(
(2)
|
(1)原式=
÷x2 (x-2)2 x x-2
=
;x x-2
(2)原式=
-x2 2-x 4 2-x
=x2-4 2-x
=(x+2)(x-2) 2-x
=-x-2
当x=
-2时,原式=-3
.3