问题
解答题
先化简,再求值:
|
答案
÷(x2-2x x2-4x+4
-x-2)x2 x-2
=
÷x(x-2) (x-2)2 x2-(x2-4) x-2
=
×x x-2 x-2 4
=
;x 4
当x=-2时,原式=
=-2.x 4
先化简,再求值:
|
÷(x2-2x x2-4x+4
-x-2)x2 x-2
=
÷x(x-2) (x-2)2 x2-(x2-4) x-2
=
×x x-2 x-2 4
=
;x 4
当x=-2时,原式=
=-2.x 4