#include <iostream>
using namespace std;
int main() {
float x,y,z;
cin>>x>>y>>z;
float E1=x+y+z;
cout << "E1 = x + y + z = "<<E1<<endl;
float E2=x*y + y*z + z*x;
cout << "E2=x*y + y*z + z*x = "<<E2<<endl;
float E3= (x + y) / (z + 1);
z==-1 ? cout<<"Erro : Mau = 0" : cout << "E3= (x + y) / (z + 1) = "<<E3;
return 0;
}
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