private void Multiplicacion_Click(object sender, EventArgs e)
{
Multiplicacion ope3 = new Multiplicacion();
ope3.V1 = double.Parse(textBox1.Text);
ope3.V2 = double.Parse(textBox2.Text);
label3.Text = ope3.calcular().ToString();
}
private void checkBox3_CheckedChanged(object sender, EventArgs e)
{
checkBox2.Checked = false;
checkBox1.Checked = false;
checkBox4.Checked = false;
Multiplicacion obj3 = new Multiplicacion();
obj3.N1 = double.Parse(textBox3.Text);
obj3.N2 = double.Parse(textBox4.Text);
label4.Text = obj3.Calculos().ToString();
}