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