public abstract Real Divide(Rational fraction);
public abstract Real Multiply(Rational fraction);
public abstract Real Subtract(Rational fraction);
public abstract Real Add(Rational fraction);
public Complex Multiply(Rational fraction)
{
throw new NotImplementedException();
}
public Complex Divide(Rational fraction)
{
throw new NotImplementedException();
}
public Complex Subtract(Rational fraction)
{
throw new NotImplementedException();
}