1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/17 22:33:28
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=1/(13×15)+1/(15×17
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
1/（13*15）=[1/13-1/15]/2
1/（15*17）=[1/15-1/17]/2
...
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=[1/13-1/39]/2
=1/39
简算:1/11×13 +1/13×15 +1/15×17 +1/17×19
(1/17+1/15)×4+13÷17简便计算
1/13*15+1/15*17+1/17*19+1/19*21、、、、、、+1/37*39=?
1/11*13*15+1/13*15*17+1/15*17*19+……+1/27*29*31
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
1/13*15+1/15*17+1/17*19+1/19*21
[17/26+0/（-1/15+2/11)]*13/17
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
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/（12×13×14）+1/（13×14×15）+1/（14×15×16）+1/（15×16×17）
11*13分之1＋13*15分之1＋15*17分之1＋17*19分之1
1+3+5+9+7+11+13+15+17+19
1-3-5+7+9-11-13+15+17-.+999
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
(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少