化简:5a2-[a2+(5a2-2a)-2(a2-3a)].
问题描述:
化简:5a2-[a2+(5a2-2a)-2(a2-3a)].
答
原式=5a2-[a2+5a2-2a-2a2+6a]
=5a2-[4a2+4a]
=5a2-4a2-4a
=a2-4a.