(1)1,3,5,7.2007,2009 (2)1,4,7,10,.2005,2008 问 同时出现在这两列数中的数一共有多少
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(1)1,3,5,7.2007,2009 (2)1,4,7,10,.2005,2008 问 同时出现在这两列数中的数一共有多少
1/2009+2/2009-3/2009-4/2009+5/2009+6/2009-7/2009-8/2009+9/2009+10/2009-...-1999/2009-2000/2009+2001/2009+2002/2009
1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011
数学题(1-1/3)*(1-1/4)*(1-1/5)*.(1-1/2009)*2009等多少?
1/(1*3)+1/(3*5)+.+1/(2007*2009)
计算1+3+5+7+...+2009+2011
1-3+5-7+.2009-2011=
(+1)+(-3)+(+5)+(-7).(+2009)+(-2011)数学题
1-3+5-7+...+2009-2011
1+3+5+……+2009=( )
1-3+5-7+...+2007-2009=?
(-1)+-2+(-3)+4+(-5)+...+(-2009)+2010
1-3+5-7...+2009-2011=
请问(2/2009+4/2009+6/2009+···+2008/2009)—(1/2009+3/2009+5/2009+···+2007/2009)等于多少?
[1+2+3+4+5+...+2009+2010]/[(1-1/1006)(1-1/1007)...(1-1/2009)(1-1/2010)]
[1+2+3+4+5+...+2009+2010]/[(1-1/1006)(1-1/1007)...(1-1/2009)(1-1/2010)]
(1-1/2)(1/3-1)(1-1/4)(1/5-1)``````(1/2009)(11/2010)
1/1*3+1/3*5+1/5*7+1/7*9+...+1/2007*2009=?