若2x2my3与-5xy2n是同类项,则|m-n|的值是( )A.0 B.7 ... 问题详情:若2x2my3与-5xy2n是同类项,则|m-n|的值是( )A.0 B.7 C.1 D.-1【回答】C知识点:整式题型:选择题...