[X]补=78H [Y]补=87H [Z]补=FFFH [W]补=800H 这四个补码的原码是多少?真值是多少?

[X]补=78H=01111000B
[X]原=01111000B=78H
真值= 120
[Y]补=87H =10000111B
[Y]原=11111001B=F9H
真值=-121
[Z]补=FFFH=111111111111B
[Z]原 =100000000001B
真值=-1
[W]补=800H=100000000000B
[W]原=100000000000B=800H
真值=0