> 数学 >
化简(
x-y
x2-2xy+y2
-
xy+y2
x2-y2
)•
xy
y-1
= ___ ．
人气：169 ℃　时间：2020-04-20 11:46:56
解答
原式=[
x-y
(x-y)2
-
y(x+y)
(x+y)(x-y)
]•
xy
y-1

=（
1
x-y
-
y
x-y
）•
xy
y-1

=
1-y
x-y
•
xy
y-1

=-
xy
x-y
．
故答案是：-
xy
x-y
．
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