(3a2-ab+7)-(-4a2+2ab+7)
问题描述:
(3a2-ab+7)-(-4a2+2ab+7)
答
原式=3a2-ab+7+4a2-2ab-7
=7a2-3ab
(3a2-ab+7)-(-4a2+2ab+7)
原式=3a2-ab+7+4a2-2ab-7
=7a2-3ab