private void btnCalcularMedia_Click(object sender, EventArgs e)
{
Calcular calcular = new Calcular();
decimal[] valores = new decimal[4];
valores[0] = 1.5m;
valores[1] = 2.5m;
valores[2] = 3.5m;
valores[3] = 4.5m;
listBox1.Items.Add(calcular.MediaElementos(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17));
listBox1.Items.Add(calcular.Media(valores).ToString());
mostrarLista(10, "oi", 5, 4.5m, "tchau...");
}