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计算(x-y+4xyx-y)(x+y-4xyx+y)的正确结果是()A.y2-x2B.x2-y2C.(x-y)2x2-y2(x≠y)D.x2-y2x2+y2\;

题目详情
计算(x-y+
4xy
x-y
)(x+y-
4xy
x+y
)的正确结果是(  )
A. y2-x2
B. x2-y2
C.
(x-y)2
x2-y2
(x≠y)
D.
x2-y2
x2+y2
\;
▼优质解答
答案和解析
(x-y+
4xy
x-y
)(x+y-
4xy
x+y
)
=
(x-y)2+4xy
x-y
(x+y)2-4xy
x+y

=
(x+y)2
x-y
(x-y)2
x+y

=(x+y)(x-y)=x2-y2,故选B.