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