【哈婗鹿】評論
0*20+1*2-1+1*2-2+0*2-3+0*2-4+1*2-5=(0*1)+(1*0.5)+(1*0.25)+(0*0.125)+(0*0.0625)+(1*0.03125)=0+0.5+0.25+0.03125=0.78125