x = -86.5 86d =1010110b0.5d =1b/2d ,将1b右移一位得，0.5d =0.1bx = -(86 +0.5)d = -(1010110 +0.1)b = -1010110.1b 设字长为9位[x]原 =11010110.1b [x]反 =10101001.0b[x]补 =10101001.1b
