#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ double c=5; double f=8; double a=12; cout<<(c+f+a)/3.0<<endl; cout<<39.0/c<<endl; cout<<39.0/f<<endl; cout<<39.0/a; return 0; }