3a²-[5a-(1∕2a-3)+2a²]+4
来源：学生作业帮助网 编辑：六六作业网 时间：2025/01/19 15:17:53
3a²-[5a-(1∕2a-3)+2a²]+43a²-[5a-(1∕2a-3)+2a²]+43a²-[5a-(1∕2a-3)+2a²]+4=
3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
3a²-[5a-(1∕2a-3)+2a²]+4
=3a²-5a+1/2a-3-2a²+4
=a²-9/2a+1