化简下列各题 (1)(5a-3a2+1)-(4a3-3a2); (2)-2(ab-3a2)-[2b2-(5ab+a2)+2ab]

问题描述:

化简下列各题
(1)(5a-3a2+1)-(4a3-3a2);
(2)-2(ab-3a2)-[2b2-(5ab+a2)+2ab]

(1)原式=5a-3a2+1-4a3+3a2=-4a3+5a+1.
(2)原式=-2ab+6a2-2b2+5ab+a2-2ab
=7a2-2b2+ab.