A.3AH B.41H C.0AH D.2AH
A.10011011 B.000101010101 C.11011001 D.10101110
A.9235 B.3457 C.8345 D. 6235
A.0∽256 B.-256∽0 C.-127∽+127 D.-128∽+127
A.00110101 B.10110101 C.01001010 D. 11001010