在a6输入:=if(or(a1=a2,a1=a3,a1=a4,a1=a5),a1,"")
A6=if(countif(A2:A5,A1),A1,"")
=if(and(A2=A1,A3=A1,A4=A1,A5=A1),a1,"")
A2/A3/A4/A5全选中,求和