因式分解:1-x2+4xy-4y2=_.
问题描述:
因式分解:1-x2+4xy-4y2=______.
答
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).