public void AssertDivide(string num1, string num2)
        {
            var a = new ALong(num1);
            var b = new ALong(num2);
            var d = AMath.Divide(a, b);

            var aa = BigInteger.Parse(num1);
            var bb = BigInteger.Parse(num2);
            var dd = aa / bb;
            var rr = aa % bb;

            Assert.IsTrue(d.Item1 == dd.ToString());
            Assert.IsTrue(d.Item2 == rr.ToString());
        }