(x-y)^2+4xy-y^2因式分解
问题描述：
(x-y)^2+4xy-y^2因式分解
答
(x-y)²+4xy-y²＝﹙x＋y﹚²－y²＝﹙x＋y－y﹚﹙x＋y＋y﹚＝x﹙x＋2y﹚.
答
x²-2xy+y²+4xy-y²
=x²+2xy
=x(x+2y)
答
(x-y)^2+4xy-y^2
=x²-2xy+y²+4xy-y^2
=x²+2xy
=x（x+2y）