问题
解答题
先化简,再求值:(
|
答案
原式=【
-3x+4 (x+1)(x-1)
】•2(x+1) (x+1)(x-1) (x-1)2 x+2
=
•x+2 (x+1)(x-1) (x-1)2 x+2
=
,x-1 x+1
当x=0时,原式=-1.
先化简,再求值:(
|
原式=【
-3x+4 (x+1)(x-1)
】•2(x+1) (x+1)(x-1) (x-1)2 x+2
=
•x+2 (x+1)(x-1) (x-1)2 x+2
=
,x-1 x+1
当x=0时,原式=-1.