=256-(100-2)=256-100+2=156+2=158求采纳,谢谢!
155+256+45-98 =(155+45)+256-(100-2)=200+256-100+2=100+258=358祝学习进步。
256-98=256-(100-2)=256-100+2=156+2=158
256-98=256-(100-2)=256-100+2=156+2=158