问题
解答题
先化简，再求值：(
|
答案
原式=[
-1 x(x-2)
]×1 (x-2)2 x(x-2) 2
=
×1 x(x-2)
-x(x-2) 2
×1 (x-2)2 x(x-2) 2
=
-1 2 x 2(x-2)
=
-x-2 2(x-2) x 2(x-2)
=
；1 2-x
当x=1时，原式=
=1．1 2-1
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先化简，再求值：(
|
原式=[
-1 x(x-2)
]×1 (x-2)2 x(x-2) 2
=
×1 x(x-2)
-x(x-2) 2
×1 (x-2)2 x(x-2) 2
=
-1 2 x 2(x-2)
=
-x-2 2(x-2) x 2(x-2)
=
；1 2-x
当x=1时，原式=
=1．1 2-1