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