计算二分之一+四分之一+八分之一.+二零四八分之一

2个回答

  • 1/2+1/4+1/8+1/16+.+1/2048

    =1/2+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+……+(1/1024-1/2048)

    =1/2+1/2-1/4+1/4-1/8+1/8-1/16+……+1/1024-1/2048

    =1/2+1/2-1/2048

    =1-1/2048

    =2047/2048