(a-b)(c+d)-(a-b)(c-d)因式分解

问题描述:

(a-b)(c+d)-(a-b)(c-d)因式分解

(a-b)(c+d)-(a-b)(c-d)
=ac+ad-bc-bd-(ac-ad-bc+bd)
=2ad-2bd
=2d(a-b)