问题
解答题
先化简,再求值:
|
答案
÷x-2 x2-1
+2x+2 x2+2x+1 1 x-1
=
×x-2 (x+1)(x-1)
+(x+1)2 2(x+1) 1 x-1
=
+x-2 2(x-1) 2 2(x-1)
=
,x 2(x-1)
把x=2代入上式得:
原式=
=1.2 2(2-1)
先化简,再求值:
|
÷x-2 x2-1
+2x+2 x2+2x+1 1 x-1
=
×x-2 (x+1)(x-1)
+(x+1)2 2(x+1) 1 x-1
=
+x-2 2(x-1) 2 2(x-1)
=
,x 2(x-1)
把x=2代入上式得:
原式=
=1.2 2(2-1)