1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384=?
问题描述:
1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384=?
答
=1/3(1+1/2+1/4+1/8+1/16+1/32+1/64+1/128)
=1/3(1-1/256)×2
=85/128