问题
解答题
先化简,再求值:(
|
答案
原式=
•x+2+x-2 (x+2)(x-2) (x+2)(x-2) x-4
=
•2x (x+2)(x-2) (x+2)(x-2) x-4
=
,2x x-4
当x=
时,原式=3
=-2 3
-43
.6+8 3 13
先化简,再求值:(
|
原式=
•x+2+x-2 (x+2)(x-2) (x+2)(x-2) x-4
=
•2x (x+2)(x-2) (x+2)(x-2) x-4
=
,2x x-4
当x=
时,原式=3
=-2 3
-43
.6+8 3 13