问题
解答题
先化简,再求值: (
|
答案
原式=[
-x+2 x(x-2)
]÷x-1 (x-2)2
,x-4 x
=
×(x+2)(x-2)-x(x-1) x(x-2)2
,x x-4
=
×x-4 x(x-2)2
,x x-4
=
,1 (x-2)2
当x=3时,原式=
=1.1 (3-2)2
先化简,再求值: (
|
原式=[
-x+2 x(x-2)
]÷x-1 (x-2)2
,x-4 x
=
×(x+2)(x-2)-x(x-1) x(x-2)2
,x x-4
=
×x-4 x(x-2)2
,x x-4
=
,1 (x-2)2
当x=3时,原式=
=1.1 (3-2)2