1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/05/10 01:40:22
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
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
1/(13×15)+1/(15×17)+1/(17×19)+…1/(37×39)=
1/13*15+1/15*17+1/17*19+1/19*21、、、、、、+1/37*39=?
1/13*15+1/15*17+1/17*19...+1/37*39=?劳烦把解题过程写清楚.
1/11*13*15+1/13*15*17+1/15*17*19+……+1/27*29*31
(1+13+15+17)×(13+15+17+19)−(1+13+15+17+19)×(13+15+17)
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 37 39 41 …… 其中
(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+
计算1/11*13*15 +1/13*15*17 +1/15*17*19+.29*31*33=?
简算:1/11×13 +1/13×15 +1/15×17 +1/17×19
1-3+5-7+9-11+13-15+17-19+21-23+25-27+29-31+33-35+37-39+41=?
简算:11×13/2+13×15/2+15×17/2+17×19/2+19/1=
11*13分之2+13*15分之2+15*17分之2+17*19分之2+19分之1=?