=SUMPRODUCT(FIND(MID(A1,ROW($1:$4),1),"abcd")*10^(4-ROW($1:$4)))
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,"a",1),"b",2),"c",3),"d",4)
两种公式随便选一种就行
理解错你的意思了,你是把数字换成字母用下面这个公式
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,1,"a"),2,"b"),3,"c"),4,"d")
请查收,公式=INDIRECT("b"&LEFT(A6))&INDIRECT("b"&MID(A6,2,1))&INDIRECT("b"&MID(A6,3,1))&INDIRECT("b"&RIGHT(A6,1))