private void formUserToolStripMenuItem_Click(object sender, EventArgs e)
{
form4.Show();
}
private void умножениеToolStripMenuItem_Click(object sender, EventArgs e)
{
Form umnoj = new Form4();
umnoj.Show();
}
private void button3_Click(object sender, EventArgs e)
{
Form4 form4 = new Form4();
form4.Show();
}
private void лабораторнаяРабота3ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form4 Form4 = new Form4(this);
Form4.Show();
}