B1中公式=IF(COUNT(B2:B4,A5:A7)=0,"",B2+B3+B4-A5-A6-A7)或=IF(COUNT(B2:B4,A5:A7)=0,"",SUM(B2:B4)-SUM(A5:A7))
B1=IF(COUNT(B2:B4,A5:A7)=0,"",B2+B3+B4-A5-A6-A7)