-2(ab-3a2)-[2b2-(5ab+a2)+2ab]
问题描述:
-2(ab-3a2)-[2b2-(5ab+a2)+2ab]
答
原式=-2ab+6a2-[2b2-5ab-a2+2ab]
=-2ab+6a2-2b2+5ab+a2-2ab
=7a2+ab-2b2.