因式分解:9-4x2+4xy-y2怎么做?急!要过程~~~谢谢了~~

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因式分解:9-4x2+4xy-y2怎么做?急!要过程~~~谢谢了~~
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因式分解:9-4x2+4xy-y2怎么做?急!要过程~~~谢谢了~~
因式分解:9-4x2+4xy-y2怎么做?急!要过程~~~谢谢了~~

因式分解:9-4x2+4xy-y2怎么做?急!要过程~~~谢谢了~~
9-4x2+4xy-y2
=3²-(2x-y)²
=(3+2x-y)(3-2x+y)

=9-(2x-y)^2
=(3+2x-y)(3-2x+y)