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