Maths問題!!!!F.2上快入!!

111(10) means this is a denary number. Its value is one hundred and eleven.
111(2) means this is a binary number. Its value is 1 x 1 + 1 x 2 + 1 x 2^2 = 1 + 2 + 4 = 7(seven).
111(16) means this is a hexadecimal number. Its value is 1 x 1 + 1 x 16 + 1 x 16^2 = 1 + 16 + 256 = 273 (two hundred and seventy-three). One more example: 123(16) = 3 x 1 + 2 x 16 + 1 x 16^2 = 3 + 32 + 256 = 291.

2008-07-07 12:23:12 補充：
So 291(10) = 123(16).