(a-b)(c+d)-(a-b)(c-d)因式分解

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(a-b)(c+d)-(a-b)(c-d)因式分解(a-b)(c+d)-(a-b)(c-d)因式分解(a-b)(c+d)-(a-b)(c-d)因式分解(a-b)(c+d)-(a-b)(c-d)=ac+

(a-b)(c+d)-(a-b)(c-d)因式分解
(a-b)(c+d)-(a-b)(c-d)因式分解

(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)

原式=ac+ad-bc-bd-ac+ad+bc-bd=2ad-2bd