问题
解答题
化简求值:
|
答案
原式=
-(a+1)(a-1) (a-1)2
•a(a-2) a-2 1 a
=
-1a+1 a-1
=a+1-a+1 a-1
=
,2 a-1
当a=
+1时,2
原式=
=2 2
.2
化简求值:
|
原式=
-(a+1)(a-1) (a-1)2
•a(a-2) a-2 1 a
=
-1a+1 a-1
=a+1-a+1 a-1
=
,2 a-1
当a=
+1时,2
原式=
=2 2
.2