问题
解答题
先化简,再求值:
|
答案
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=
时,原式=1 2
=-2.2× 1 2
-11 2
先化简,再求值:
|
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=
时,原式=1 2
=-2.2× 1 2
-11 2