问题
解答题
化简求值:
|
答案
原式=
+(x+1)(x-1) (x-1)2
•x(x-2) x-2
=1 x
+x+1 x-1
=x-1 x-1
,2x x-1
当x=
-1时,原式=2
=2(
-1)2
-1-12
=-(2
-2)(2
+2)2 (
-2)(2
+2)2
.2
化简求值:
|
原式=
+(x+1)(x-1) (x-1)2
•x(x-2) x-2
=1 x
+x+1 x-1
=x-1 x-1
,2x x-1
当x=
-1时,原式=2
=2(
-1)2
-1-12
=-(2
-2)(2
+2)2 (
-2)(2
+2)2
.2