(3a—ab+7)—(—4a+2ab+7)等于多少?
问题描述:
(3a—ab+7)—(—4a+2ab+7)等于多少?
.每一步都要列出来..
答
(3a—ab+7)—(—4a+2ab+7) =3a—ab+7+4a-2ab-7 =3a+4a-ab-2ab+7-7 =7a-3ab
(3a—ab+7)—(—4a+2ab+7)等于多少?
.每一步都要列出来..
(3a—ab+7)—(—4a+2ab+7) =3a—ab+7+4a-2ab-7 =3a+4a-ab-2ab+7-7 =7a-3ab