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