你好！
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
=(1-1/2)+(1/纤绝2-1/4)+...+(1/128-1/256)
=1-1/搜袜2+1/2-1/4+1/4...-1/256
=1-1/256
=255/256
【希望可以世竖激帮到你】
如果题目没卖型错的话，= 1/中运猜悄唤2 + 4 + 8 + 16 + 32+ 64+128+256
=1/2 +4 + 4 + 8 + ...+ 256 -4
=1/2 + 512 - 4
=1/2 + 498
=498.5