1/1*2+1/2*3+1/3*4+……+1/2009*2010=?1/1*3+1/3*5+1/5*7+……+1/2007*2009=?1/1*4+1/4*7+1/7*10+……+1/2008*2011=?1/n*(n+k)=?因为不会打分数,所以用/来表示
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 10:56:10
![1/1*2+1/2*3+1/3*4+……+1/2009*2010=?1/1*3+1/3*5+1/5*7+……+1/2007*2009=?1/1*4+1/4*7+1/7*10+……+1/2008*2011=?1/n*(n+k)=?因为不会打分数,所以用/来表示](/uploads/image/z/12705457-49-7.jpg?t=1%2F1%2A2%2B1%2F2%2A3%2B1%2F3%2A4%2B%E2%80%A6%E2%80%A6%2B1%2F2009%2A2010%3D%3F1%2F1%2A3%2B1%2F3%2A5%2B1%2F5%2A7%2B%E2%80%A6%E2%80%A6%2B1%2F2007%2A2009%3D%3F1%2F1%2A4%2B1%2F4%2A7%2B1%2F7%2A10%2B%E2%80%A6%E2%80%A6%2B1%2F2008%2A2011%3D%3F1%2Fn%2A%28n%2Bk%29%3D%3F%E5%9B%A0%E4%B8%BA%E4%B8%8D%E4%BC%9A%E6%89%93%E5%88%86%E6%95%B0%2C%E6%89%80%E4%BB%A5%E7%94%A8%2F%E6%9D%A5%E8%A1%A8%E7%A4%BA)
1/1*2+1/2*3+1/3*4+……+1/2009*2010=?1/1*3+1/3*5+1/5*7+……+1/2007*2009=?1/1*4+1/4*7+1/7*10+……+1/2008*2011=?1/n*(n+k)=?因为不会打分数,所以用/来表示
1/1*2+1/2*3+1/3*4+……+1/2009*2010=?
1/1*3+1/3*5+1/5*7+……+1/2007*2009=?
1/1*4+1/4*7+1/7*10+……+1/2008*2011=?
1/n*(n+k)=?
因为不会打分数,所以用/来表示
1/1*2+1/2*3+1/3*4+……+1/2009*2010=?1/1*3+1/3*5+1/5*7+……+1/2007*2009=?1/1*4+1/4*7+1/7*10+……+1/2008*2011=?1/n*(n+k)=?因为不会打分数,所以用/来表示
1/1*2+1/2*3+1/3*4+……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+..-..-1/2009+1/2009-1/2010
=1-1/2010
=2009/2010
1/1*3+1/3*5+1/5*7+……+1/2007*2009
=1/2*(1-1/3+1/3-1/5+1/5-1/7+..-...-1/2007+1/2007-1/2009)
=1/2*(1-1/2009)
=1004/2009
1/1*4+1/4*7+1/7*10+……+1/2008*2011
=1/3*(1-1/4+1/4-1/7+1/7-1/10+..-...-1/2008+1/2008-1/2011)
=1/3*(1-1/2011)
=2008/6033
1/n*(n+k)
=1+k/n