平均值，
求平均值
http://www.nowcoder.com/questionTerminal/d1c7262fbcdf47c09538319d1ab0deda
include
include
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
double d;
a=a+b+c;
d=(double)a/3;
cout<<fixed<<setprecision(6)<<(double)d<<endl;
return 0;
}
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