public static void Main()
Console.WriteLine("Math.Abs("+a+")="+ Math.Abs(a));
Console.WriteLine("Math.Abs("+b+")="+ Math.Abs(b));
Console.WriteLine(Math.Abs(a+b));
Console.WriteLine("Math.Pow("+a+",2)="+ Math.Pow(a,2));
Console.WriteLine(Math.Pow(b,10));