S. O6nuTM: a) =SUM(5;AVERAGE(8;12;7);6);
6) =MAX(6,30;16)-MIN(54,25)​

Как-то так
#include <iostream>
using namespace std;
int main(){    cout << "Vvedute kol-vo ocenok" << endl;
    int n,i,a,Four,Five;    n = i = a = Four = Five = 0;
    cin >> n;
    for (i = 1; i <= n; i++)    {        cin >> a;        if (a == 4){         Four++;}  else if (a == 5)      {         Five++;      }    }    if (Four > Five){   cout << "Four" << endl;} else if (Five > Four)      {   cout << "Five" << endl;      }      else      {         cout << "Equal"<< endl;      }      cout << "Kol-vo 4: " << Four << " Kol-vo 5: " << Five << endl;    return 0;}

Код#include <iostream>constexpr double bites_to_megabytes(double a) {    return a / 8388608;}constexpr double megabytes_to_gigabytes(double a) {    return a / 1024;}int main() {    long long a;    short type;    bool is_correct = false;    double answer;    do {        std::cin >> a;        std::cout << "[1] Megabytes \n"                  << "[2] Gigabytes \n"                  << "Convert to [1] or [2]: ";        std::cin >> type;        if (type == 1 or type == 2) {            is_correct = true;        } else {            std::cout << "Meh. Try to type again. \n" << std:: endl;        }    } while (!is_correct);    switch (type) {        case 1:            answer = bites_to_megabytes(a);            break;        case 2:            answer = megabytes_to_gigabytes(bites_to_megabytes(a));            break;    }    std::cout << "An answer of conversion is " << answer << std::endl;    return 0;}