因式分解:1-x2+4xy-4y2=______.
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因式分解:1-x2+4xy-4y2=______.
原式=1-(x2-4xy+4y2)
=1-(x-2y)2
=(1+x-2y)(1-x+2y).
故答案为(1+x-2y)(1-x+2y).
=1-(x-2y)2
=(1+x-2y)(1-x+2y).
故答案为(1+x-2y)(1-x+2y).
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