private void buttonRandom_Click(object sender, RoutedEventArgs e)
        {
            Drob[] drobs = new Drob[4];
            for (int i = 0; i < 4; i++)
            {
                Random random = new Random();
                drobs[i] = new Drob(random.Next(1, (i + 3) * 4), random.Next(1, (i + 1) * 5));
                Drob.Down(drobs[i]);
            }

            textBoxFirstNum.Text   = drobs[0].Num.ToString();
            textBoxFirstDenom.Text = drobs[0].Denom.ToString();

            textBoxSecondNum.Text   = drobs[1].Num.ToString();
            textBoxSecondDenom.Text = drobs[1].Denom.ToString();

            textBoxThirdNum.Text   = drobs[2].Num.ToString();
            textBoxThirdDenom.Text = drobs[2].Denom.ToString();

            textBoxFourthNum.Text   = drobs[3].Num.ToString();
            textBoxFourthDenom.Text = drobs[3].Denom.ToString();

            labelResultFirst.FontSize  = 16;
            labelResultFirst.Text      = "Дробь№1\n" + drobs[0].ToString();
            labelResultSecond.FontSize = 16;
            labelResultSecond.Text     = "Дробь№2\n" + drobs[1].ToString();
            labelResultThird.FontSize  = 16;
            labelResultThird.Text      = "Дробь№3\n" + drobs[2].ToString();
            labelResultFourth.FontSize = 16;
            labelResultFourth.Text     = "Дробь№4\n" + drobs[3].ToString();
        }
        private void result2_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Drob drob1 = new Drob(double.Parse(textBoxFirstNum.Text), double.Parse(textBoxFirstDenom.Text));
                Drob drob2 = new Drob(double.Parse(textBoxSecondNum.Text), double.Parse(textBoxSecondDenom.Text));
                Drob drob3 = new Drob(double.Parse(textBoxThirdNum.Text), double.Parse(textBoxThirdDenom.Text));
                Drob drob4 = new Drob(double.Parse(textBoxFourthNum.Text), double.Parse(textBoxFourthDenom.Text));

                Drob result = (drob4 + drob2) / (drob1 - drob3);
                textBlockResul.Text = Drob.Down(result).ToString();
            }
            catch (Exception exception)
            {
                MessageBox.Show(exception.Message);
            }
        }