1,Min(2,1)=1
2,SUM(4,1,5)=4+1+5=10
3,average(8,10)=(8+10)/2=9
结果为 9
9
min(2,1)=1
sum(4,min(2,1),5)=sum(4,1,5)=10
average(8,10)=18/2=9
min(2,1)=1
2,1两者的最小值
sum(4,min(2,1),5)=sum(4,1,5)=10
4,1,5相加
average(8,sum(4,min(2,1),5))=average(8,10)=9
8,10的平均值
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