问题
填空题
已知x=
|
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(x-1) 2(x+1)(x-1)
=
+(x-2)(x-1) 2(x-1)(x+1) 2(x-1) 2(x+1)(x-1)
=(x-2)(x-1)+2(x-1) 2(x-1)(x+1)
=
，x 2(x+1)
把x=
+1代入上式得：2
原式=
=4
+12 2(
+1+1)2
，2
故答案为：4
．2