剑网三同人肉图 霸王兔:1/(12×13)+1/(13×14)+……+1/(19×20)的值为:
来源:百度文库 编辑:高校问答 时间:2024/05/08 11:40:46
a.1/12 b.1/20 c.1/30 d.1/40
最好能有详细的解答过程
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=1/12-1/13+1/13-1/14+……+1/19-1/20
=1/12-1/20
=1/30
1/(12×13)+1/(13×14)+……+1/(19×20)
=1/12-1/13+1/13-1/14+……+1/19-1/20
=1/12-1/20
=1/30
1/(12×13)+1/(13×14)+1/(14×15)。。。+1/(19×20)=?
1/(12×13)+1/(13×14)+……+1/(19×20)的值为:
1/11+1/12+1/13+1/14+1/15
比较大小:1/11+1/29 1/12+1/25 1/13+1/21 1/14+1/19
1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?
1/2,1,1,( ?),9/11,11/13
1,3/5,2/5,(?),3/13,7/13
1,3/5,2/5,(?),3/13,7/13
7/12=1/?+1/?+1/?
1/√5 1/3√7 1/12 1/7√11 1/11√13的排列规律