sz-raetsel.cs

static void Main(string[] args)
{
    for (int s = 0; s <= 9; s++)
    {
        for (int p = 0; p <=9; p++)
        {
            for (int d = 0; d <= 9; d++)
            {
                int left = GetDecimal(s, p, d);
                int right = Calculate(s, p, d);

                if (left == right)
                    Console.WriteLine("{0} = ({1} + {2} + {3}) x {4} x {5} x {6}", left, s, p, d, s, p, d);
            }
        }
    }
    Console.ReadKey();
}

static int Calculate(int s, int p, int d)
{
    return (s + p + d) * s * p * d;
}
static int GetDecimal(int s, int p, int d)
{
    string dec = string.Format("{0}{1}{2}", s, p, d);
    int value = Convert.ToInt32(dec);
    return value;
}