若2x2my3與-5xy2n是同類項,則|m-n|的值是( )A.0 B.7 ... 問題詳情:若2x2my3與-5xy2n是同類項,則|m-n|的值是( )A.0 B.7 C.1 D.-1【回答】C知識點:整式題型:選擇題...