因为:某整式+(ab-2bc+3ac)=(-2ab+bc+8ac)
所以:
某整式=(bc+8ac-2ab)-(ab-2bc+3ac)=3bc-5ac-3ab
正确结果=某整式-(ab-2bc+3ac)
=(3bc-5ac-3ab)-(ab-2bc+3ac)
=5bc-8ac-4ab