using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(f1(0.55));

            f2(10, 3, 4);

            Console.WriteLine();

            Console.WriteLine(f3(new double[]{1, 2, 3}, new double[]{1, 2, 3}));

    }

    static double f1 (double x)

        {

            double result = 0;

            result = (1 / 7 + Math.Log(Math.Sqrt(x), Math.E)) * Math.Pow((Math.E), (Math.Sqrt(x - 2)));

            return result;

        }

​

        static void f2 (int N, double A, double B)

        {

            double delta = (B - A) / N;

            for (int i = 0; i < N; i++)

            {

                Console.WriteLine((i+1) + "  " + (A + i*delta) + "  " + f1(A + i*delta));

            }

        }

​

        static double f3 (double[] A, double[] B)

        {

            double P = 0;

            for (int i = 0; i < A.Length; i++)

                P += A[i] * B[i];

            return P;

        }

}