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