1/1*2+1/2*3+1/3*4+……+1/2009*2010=?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/29 07:49:53
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*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
=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
1+2+3+4……+2008+2009+2010=?
1/1×2+1/2×3+1/4×5+……+1/2009×2010
(-1)+(+2)+(-3)+(+4)+……+(-2009)+(+2010)等于多少
1-2+3-4+5……2009-2010
(1+3+5+…+2009)-(2+4+6…+2010)
计算:-1+2-3+4-5……-2009+2010
1+2+3+4+5+6……+2009+2010
(1+3+5……+2009)-(2+4+6+……+2010)=?
|1/3+(-1/2)|+|1/4+(-1/3)|+|1/5+(-1/4)|+……+|1/2010+(-1/2009)|
2012+2011+2010+2009+……+3+2+1=?
1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)