itog/ClassLibrary1/Class1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLibrary1
{
    public class Class1
    {
        public double fun1(double a, double b)
        {
            double rez = fun2( a,  b);
            Console.WriteLine($"Промежуточное значение rez {rez}");
            return (a * b) / rez;
        }
        public double fun2(double a , double b)
        {
            while(b!=0)
            {
                double temp = b;
                b = a % b;
                a = temp;
            }
            Console.WriteLine($"Промежуточное значение a {a}");
            return a;
        }

    }
}