Sn=1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+……>1+1/2+(1/4+1/4)+(1/8+1/8+1/8+1/8)+……＝1+1/2+1/2+1/2+……当然是发散级数.
