例2-1-2 (11110010) 1*28+1*27+1*26+1*25+ 0*24+0*23+1*22+1*21+ 0*20例 2-1-2 = 1 * 28 + 1 * 27 + 1 * 26 + 1 * 25 + 0 * 24 + 0 * 23 + 1 * 22 + 1 * 21 + 0 * 20 ( 111100110 )二