第1个回答 2018-12-22
(a+b)(c-d)=ac-ad+bc-bd
(a-b)(c+d)=ac+ad-bc-bd
(a-b)(c-d)=ac-ad-bc+bd
第2个回答 2017-06-04
(a+b)*(c-d)=ac-ad+bc-bd
(a-b)*(c+d)=ac+ad-bc-bd
(a-b)*(c-d)=ac-ad-bc+bd本回答被提问者采纳
第3个回答 2017-06-04
(a+b)*(c-d)=ac+bc-ad-bd
(a-b)*(c+d)=ac-bc+ad-bd
(a-b)*(c-d)=ac-bc-ad+bd