问题
解答题
先化简,再求值:
|
答案
+x2-4 x2-4x+4
÷x,x2-x x-1
=
+(x-2)(x+2) (x-2) 2
×x(x-1) x-1
,1 x
=
+1,x+2 x-2
=
,2x x-2
当x=
时,原式=3 2
=2x x-2
=-6.2× 3 2
-23 2
先化简,再求值:
|
+x2-4 x2-4x+4
÷x,x2-x x-1
=
+(x-2)(x+2) (x-2) 2
×x(x-1) x-1
,1 x
=
+1,x+2 x-2
=
,2x x-2
当x=
时,原式=3 2
=2x x-2
=-6.2× 3 2
-23 2