化简 3(-3a^2-2a)-[a^2-2(5a-4a^2+1)-3a]_数学解答

化简 3(-3a^2-2a)-[a^2-2(5a-4a^2+1)-3a]

人气：433 ℃　时间：2019-11-18 01:34:44

解答

3(-3a²-2a)-[a²-2(5a-4a²+1)-3a]
=-9a²-6a-(a²-10a+8a²-2-3a)
=-9a²-6a-(9a²-13a-2)
=-9a²-6a-9a²+13a+2
=-18a²+7a+2