x2-2x+2y-y2因式分解

问题描述:

x2-2x+2y-y2因式分解

x2-2x+2y-y2
=﹙x+y﹚﹙x-y﹚-2﹙x-y﹚
=﹙x-y﹚﹙x+y-2﹚