问题
解答题
先化简
|
答案
原式=
-1 x+1
•1 (x+1)(x-1) (x-1)2 x+1
=
-1 x+1 x-1 (x+1)2
=x+1-x+1 (x+1)2
=
,2 (x+1)2
当x=2时,原式=
.2 9
先化简
|
原式=
-1 x+1
•1 (x+1)(x-1) (x-1)2 x+1
=
-1 x+1 x-1 (x+1)2
=x+1-x+1 (x+1)2
=
,2 (x+1)2
当x=2时,原式=
.2 9