问题
解答题
先化简,再求值(
|
答案
原式=
×x2+2x-x2+2x (x-2)(x+2) x-2 4x
=
×4x (x-2)(x+2) x-2 4x
=
,1 x+2
当x=
-2时,原式=2
=1
-2+22
.2 2
先化简,再求值(
|
原式=
×x2+2x-x2+2x (x-2)(x+2) x-2 4x
=
×4x (x-2)(x+2) x-2 4x
=
,1 x+2
当x=
-2时,原式=2
=1
-2+22
.2 2