1/2+3/4+7/8+15/16+31/32+127/128+255/256解,得：==1/2+(1-1/4)+(1-1/8)+(1-1/16)+(1-1/32)+(1-1/128)+(1-1/256)==1/2+1-1/4+1-1/8+1-1/16+1-1/32+1-1/128+1-1/256==6+1/2-(1/4+1/8)-(1/16+1/32)-(1/128+1/256)==6+1...