计算1/(3*5)+1/(5*7)+……+1/(2007*2009) 的值
1个回答
展开全部
1/(3*5)+1/(5*7)+……+1/(2007*2009)
=(1/3-1/5)÷2+(1/5-1/7)÷2+……+(1/2007-1/2009)÷2
=[(1/3-1/5)+(1/5-1/7)+……+(1/2007-1/2009)]÷2
=(1/3-1/5+1/5-1/7+……+1/2007-1/2009)÷2
中间可以互相抵消
=(1/3-1/2009)÷2
=2006/6027÷2
=1003/6027
=(1/3-1/5)÷2+(1/5-1/7)÷2+……+(1/2007-1/2009)÷2
=[(1/3-1/5)+(1/5-1/7)+……+(1/2007-1/2009)]÷2
=(1/3-1/5+1/5-1/7+……+1/2007-1/2009)÷2
中间可以互相抵消
=(1/3-1/2009)÷2
=2006/6027÷2
=1003/6027
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