已知X1=+0010100,Y1=+0100001,X2=0010100,Y2=0100001,試計算下列各式(設字長為8位)。 (1)[X1+Y1]補=[X1]補+[Y1]補=() (2)[X1-Y2]補=[X1]補+[-Y2]補=() (3)[X2-Y2]補=[X2]補+[-Y2]補=() (4)[X2+Y2]補=[X2]補+[Y2]補=()