问题
解答题
（1）化简：
（2）先化简：
|
答案
（1）原式=
+1 x+1 2x+1 (x+1)(x-1)
=
+x-1 (x+1)(x-1) 2x+1 (x+1)(x-1)
=x-1+2x+1 (x+1)(x-1)
=
；3x x2-1
（2）原式=
+(x+1)(x-1) (x-1)2
•x(x-2) x-2 1 x
=
+1x+1 x-1
=
，2x x-1
当x=2时，原式=
=4．2x x-1