=UPPER(LEFT(I10))&LOWER(RIGHT(I10,LEN(I10)-1))晕，一个不小心跟别人回复了一样的公式，请忽略，一楼道友的答案是正确地
=replace(lower(A1),1,1,upper(left(A1)))
=UPPER(LEFT(A1))&LOWER(MID(A1,2,LEN(A1)))
=UPPER(LEFT(A1))&RIGHT(A1,LEN(A1)-1)
