化简求值：﹣3﹙a³-a²+2a-1﹚-2﹙﹣3a³+2a²-1/2a+2﹚-3(﹣a&#_数学解答

化简求值：﹣3﹙a³-a²+2a-1﹚-2﹙﹣3a³+2a²-1/2a+2﹚-3(﹣a³-a²+2a+1﹚
,其中a=﹣2

人气：141 ℃　时间：2020-03-13 07:15:55

解答

﹣3﹙a³-a²+2a-1﹚-2﹙﹣3a³+2a²-1/2a+2﹚-3(﹣a³-a²+2a+1﹚=-3a³+3a²-6a+3+6a³-4a²+a-4+3a³+3a²-6a-3=6a³+2a²-11a-4=6×(-2)³+2×(-2...