相关5a22a的文学知识

(5a2+2a﹣1)-4(3﹣8a+2a2)  

(5a2+2a﹣1)-4(3﹣8a+2a2)  

问题详情:(5a2+2a﹣1)-4(3﹣8a+2a2)  【回答】解:原式=5a2+2a﹣1-12+32a-8a2        =(5a2-8a2)+(2a+32a)-(1+12)        =-3a2+34a-13…4分                               ...