数学，详细解答，谢谢（1/3+1/6+1/12+1/24+1/4
（1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384）×128
（1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384）×128 =(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384+1/384-1/384)*128 =(2/3-1/384)*128 =255/3=85