3a²-[5a-(1∕2a-3)+2a²]+4
问题描述:
3a²-[5a-(1∕2a-3)+2a²]+4
答
=3a²-5a+1/2a-3-2a²+4
=a²-9/2a+1
3a²-[5a-(1∕2a-3)+2a²]+4
=3a²-5a+1/2a-3-2a²+4
=a²-9/2a+1