. شگفتی های اعداد

11 = 2 + (9×1)

222 = 33 + (9×21)

3333 =  444 + (9×321)

44444 = 5555 + (9×4321)

555555 = 66666 + (9×54321)

6666666 = 777777 + (9×654321)

77777777 = 8888888 + (9×7654321)

888888888 = 99999999 + (9×87654321)