using System;

​

public class Program

{

    public static void Main()

    {

        Random rnd = new Random();

        int[] matriz = new int[3];

        int[,] incog = new int[3,4];

        for(int i = 0; i < 3; i++)

            matriz[i] = rnd.Next(-15,16);

        for (int i = 0; i < 3; i++)

            for(int j = 0; j < 3; j++)  

                incog[i,j] = rnd.Next(-15,16);

        incog[0,3] = incog[0,0] * matriz[0] + incog[0,1] * matriz[0] + incog[0,2] * matriz[0];

        incog[1,3] = incog[0,1] * matriz[1] + incog[1,1] * matriz[1] + incog[1,2] * matriz[1];

        incog[2,3] = incog[0,2] * matriz[2] + incog[2,1] * matriz[2] + incog[2,2] * matriz[2];

        for (int i = 0; i < 3; i++)

        {

            for (int j = 0; j < 4; j++)

            {

                Console.WriteLine(incog[i,j]);

            }

        }

    }

}