问题
解答题
先化简代数式(
|
答案
原式=[
+(a+1)(a-1) (a-1)2
]×1 (a-1)2 a-1 a
=
×a2 (a-1)2 a-1 a
=
,a a-1
当x=2时,原式=
=2.2 2-1
先化简代数式(
|
原式=[
+(a+1)(a-1) (a-1)2
]×1 (a-1)2 a-1 a
=
×a2 (a-1)2 a-1 a
=
,a a-1
当x=2时,原式=
=2.2 2-1