a)

#include 

using namespace std;

int main(int argc, char **argv)
{
  float U = 1;

  cout << "U0 = " << U << endl;

  for (int n = 1; n <= 10; n++) {
    U = U / n;

    cout << "U" << n << " = " << U << endl;
  }

  return 0;
}
b)

#include 

using namespace std;

int main(int argc, char **argv)
{
  float U = 1;
  float V = U;

  cout << "U0 = " << U << endl;

  for (int n = 1; n <= 10; n++) {
    U = U / n;
    V = V + U;

    cout << "U" << n << " = " << U << endl;
    cout << "V" << n << " = " << V << endl;
  }

  return 0;
}