评分等级：=IF(C3>=90,"优秀",IF(C3>=80,"良好",IF(C3>=60,"及格","不及格")))

求男生的数学总成绩：=SUMIF(B3:B21,"男",C3:C21)

求合格男生的数学总成绩：=SUMIFS(C3:C21,C3:C21,">60",B3:B21,"男")

统计人数：=COUNT(C3:C21)

数学成绩大于80人数：=COUNTIF(C3:C21,">80")

数学成绩大于80的男生人数：=COUNTIFS(C3:C21,">80",B3:B21,"男")