public static DaThuc operator -(DaThuc f, DaThuc g)
{
DaThuc h = new DaThuc();
int maxbac = Math.Max(f.n, h.n);
h.n = maxbac;
for (int i = 0; i <= h.n; i++)
{
h.dt[i] = f.dt[i] - g.dt[i];
}
return(h);
}
static void Main(string[] args)
{
DaThuc dt1 = new DaThuc();
DaThuc dt2 = new DaThuc();
dt1.Nhap();
dt1.xuat();
dt2.Nhap();
dt2.xuat();
Console.WriteLine("Toan tu +, - ");
DaThuc dt3 = new DaThuc();
dt3 = dt1 + dt2;
dt3.xuat();
dt3 = dt1 - dt2;
dt3.xuat();
}