问题
解答题
先化简,再求值:(
|
答案
(
-2x x2-4
)÷1 x-2
=x x+2
.2x-(x+2) (x-2)(x+2)
(3分)x+2 x
=
(5分)1 x
当x=
时,原式=2008.(7分)1 2008
先化简,再求值:(
|
(
-2x x2-4
)÷1 x-2
=x x+2
.2x-(x+2) (x-2)(x+2)
(3分)x+2 x
=
(5分)1 x
当x=
时,原式=2008.(7分)1 2008