问题
解答题
先化简:(
|
答案
(
-3x x-2
)÷x x+2 2x x2-4
=(
-3x x-2
)×x x+2 (x+2)(x-2) 2x
=
×3x x-2
-(x+2)(x-2) 2x
×-x x+2
)÷-x x+2
)÷(x+2)(x-2)2xx x+2
=
-3(x+2) 2 x-2 2
=x+4,
把x=1时代入上式得:
原式=1+4=5.
先化简:(
|
(
-3x x-2
)÷x x+2 2x x2-4
=(
-3x x-2
)×x x+2 (x+2)(x-2) 2x
=
×3x x-2
-(x+2)(x-2) 2x
×-x x+2
)÷-x x+2
)÷(x+2)(x-2)2xx x+2
=
-3(x+2) 2 x-2 2
=x+4,
把x=1时代入上式得:
原式=1+4=5.