ActiveCell.FormulaR1C1 = _
"=IF(RC[-8]>=LARGE(R2C13:R4173C13,ROUND(COUNTA(R2C2:R4173C2)*0.15,0)),""A"",IF(RC[-8]>=LARGE(R2C13:R4173C13,ROUND(COUNTA(R2C2:R4173C2)*0.5,0)),""B"",IF(RC[-8]>=LARGE(R2C13:R4173C13,ROUND(COUNTA(R2C2:R4173C2)*0.95,0)),""C"",""D""))
怎么理解这个公式?是什么意思按公式去理解?