excel 有英文字母的数字该怎么求和?答:=SUM(--LEFT($A$1:$A$13,FIND("#",SUBSTITUTE($A$1:$A$13,B2,"#"))-1))+SUM(--IF(ISERROR(FIND("#",SUBSTITUTE(A$1:A$13,B2,"#",2))),0,MID(A$1:A$13,FIND("#",SUBSTITUTE(A$1:A$13,B2,"#",1))+1,FIND("#",SUBSTITUTE(A$1:A$13,B2,"#",2))-FIND...