465-298=465-（300-2）=177十2=179
465-298=465-(300+2)=465-298=176
如下所示465-298=465-(300-2)=465-300+2=165+2=167望采纳，谢谢！
将298看成300 再补加2即 465-298 =465+2-300 =167
465-298=465-300+2=165+2=167
