=TEXT(COUNTIF(A1:A3,B1),"[<>3]错;我不知道该显示什么")
=if(countif(A1:A3,B1)=3,"对","错")
在C1中输入或复制粘贴下列公式之一=IF(COUNTIF(A1:A3,B1)<3,"错","对")=IF(COUNTIF(A1:A3,B1)=3,"对","错")
C1=IF(COUNTIF(A1:A3,B1)<3,"错","")