(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1/255)+(1-1/323)+(1-1/399)+(1-1/483)
1个回答
展开全部
(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1/255)+(1-1/323)+(1-1/399)+(1-1/483)
=1×10-(1/15+1/35+1/63+1/99+1/143+1/195+1/255+1/323+1/399+1/483)
=10-(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21+1/21-1/23)
=10-1/3+1/23
=9又49/69
=1×10-(1/15+1/35+1/63+1/99+1/143+1/195+1/255+1/323+1/399+1/483)
=10-(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21+1/21-1/23)
=10-1/3+1/23
=9又49/69
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询