1/11×13×15+1/13×15×17+······+1/29×31×33
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1/11×13×15+1/13×15×17+······+1/29×31×331/11×13×15+1/13×15×17+······+1/29×31×331/11×13×15+1/13×15×17+
1/11×13×15+1/13×15×17+······+1/29×31×33
1/11×13×15+1/13×15×17+······+1/29×31×33
1/11×13×15+1/13×15×17+······+1/29×31×33
由1/[(2n-1)(2n+1)(2n+3)]={1/[2n-1)(2n+1)]-1/(2n+1)(2n+3)]}/4
1/(11×13×15)+1/(13×15×17)+……+1/(29×31×33)
=1/4{[1/(11×13)-1/(13×15)]+[1/(13×15)-1/(15×17)]+……+[1/(29×31)-1/(31×33)]}
=1/4{1/(11×13-1/(31×33)}
=20/(13×31×33)=20/13299
1/11×13×15=（1/11×13-1/13×15）/4依次拆项，消项即可
1+10+11+12+13+14+15
按规律填数:1,-3.5,-7.9,-11( ) a.-13,15 b.13,15 c.13-,15 d.-13,-15
|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
简算:1/11×13 +1/13×15 +1/15×17 +1/17×19
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
1/(11*13*15)+1/(13*15*17)+.+1/(29*31*33)=如何解答
数奥难题：1/11×13×15+1/13×15×17+.1/29×31×33
1/(11*13*15)+1/(13*15*17)+.+1/(29*31*33)=
1-5/24-11/24-13/15+1/5+13/15=?
找规律1,15,11,13,21,11,(),()
找规律：1,15,11,13,21,11,（）（）
1/11*13*15+1/13*15*17+1/15*17*19+……+1/27*29*31
简算：(1/13)-(1/15)*26*15
1×1×1+3×3×3+5×5×5+7×7×7+9×9×9+11×11×11+13×13×13+15×15×15这题怎么计算?
计算1/11*13*15 +1/13*15*17 +1/15*17*19+.29*31*33=?1/11*13*15 +1/13*15*17 +1/15*17*19+.29*31*33=?1/11*13*15 +1/13*15*17 +1/15*17*19+.1/29*31*33=?
2/11*13+2/13*15+2/15*17+2/17*19+1/19
简算1*3/1+3*5/1+5*7/1+7*9/1+9*11/1+11*13/1+13*15/1+15*17/1+17*19/1