没找到好的方法,看看这个可不可行(先找出最后一个有数字的行号,再判断比较):
=MAX(FREQUENCY(IF(OFFSET($BU$6,,,LOOKUP(9^9,BU:BU,ROW(BU:BU))-5)=0,ROW(OFFSET($BU$6,,,LOOKUP(9^9,BU:BU,ROW(BU:BU))-5)),""),IF(OFFSET($BU$6,,,LOOKUP(9^9,BU:BU,ROW(BU:BU))-5)>0,ROW(OFFSET($BU$6,,,LOOKUP(9^9,BU:BU,ROW(BU:BU))-5)),"")))