# include<iostream> # include<cstdio> using namespace std; int main(){ double x,y,z; x=5.0; y=8.0; z=12.0; printf("%.3lf\n",(x+y+z)/3); cout<<39/5<<" "<<39%5<<endl; cout<<39/8<<" "<<39%8<<endl; cout<<39/12<<" "<<39%12<<endl; return 0; }