1减2/3减1/6减1/12减1/24减1/48减……减1/768等于多少?
问题描述:
1减2/3减1/6减1/12减1/24减1/48减……减1/768等于多少?
答
1减2/3减1/6减1/12减1/24减1/48减……减1/768
=1/3×(1-1/2-1/4-1/8-1/16-……-1/256)
=1/3×【1-(1-1/256)】
=1/3×1/256
=1/768