1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011

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1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011
x)372672Zz@\ HXBؖ@MR>I lHi{mt54iv ḿ壆e@5Lb80NH5m L!,.H̳b(p[t \e wgfn  b

1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011
1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011

1/1*3+1/3*5+1/5*7+.+1/2007*2009+1/2009*2011
原式=1/2（1-1/3+1/3-1/5+1/5-1/7+1/7-1/9……+1/2007-1/2009+1/2009-1/2011）
=1/2（1-1/2011)=1005/2011

1/1*3+1/3*5+1/5*7+........+1/2007*2009+1/2009*2011
=（1-1/3+1/3-1/5.....-1/2011）*3
=1/2010*3
=1/670

1-3+5-7+... (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简算(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简便计算 1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945 (1/3+1/5+1/7)*(1/5+1/7+1/9)-(1/3+1/5+1/7+1/9)*(1/5+1/7)=? 1/3+1/5+1/7+.+1/2n+1 1/1*3*5+1/3*5*7+1/5*7*9.+1/95*97*99 1/1×3+1/3×5+1/5×7+1/7×9.+1/2011×2013 简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 1/1*3+1/3*5+1/5*7+1/7*9+...1/17*19= 计算1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+.+1/(19×21) 1/1×3+1/3×5+1/5×7+1/7×9+.+1/2013×2015 1/1*3+1/3*5+1/5*7+1/7*9+.+1/101*103 帮帮忙1/1*3+1/3*5+1/5*7+1/7*9+...1/99*101 1/1*3+1/3*5+1/5*7+1/7*9+1/49*51= 计算：1/1×3+1/3×5+1/5×7+1/7×9``````+1/2001×2003 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1 1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1