Răspuns:
1)
int a, b;
cin >> a >> b;
if (a < b) cout << a;
else cout << b;
2)
int a, b;
cin >> a >> b;
if (a%5==0&&b%5==0) cout << a*b;
else cout << a + b;
3)
int a, b, c;
cin >> a >> b >> c;
if(a<b && a < c) cout << a;
else if (b < a && b < c) cout << b;
else cout << c;
4)
int a, b, c;
cin >> a >> b >> c;
if(a+b>c || b+c>a || a+c>b) cout << "DA";
else cout << "NU";
5)
int a, b;
cin >> a >> b;
if(a>0 && b>0 || a<0&&b<0)
cout << sqrt(a*b);
else cout << "NU SE POATE";