邓超与董洁是什么关系
2023-11-21 05:46:14
等差数列tn表示什么
tn=1-an
则有t1=a1
所以a1=1-a1
==>a1=1/2
==>t1=1/2
因为an=tn/t[n-1]
则有tn=1-tn/t[n-1]
==>tn*t[n-1]=t[n-1]-tn
==>1/tn-1/t[n-1]=1
所以1/tn是首项
为1/t1=2,公差为1的等差数列
所以1/n=2+(n-1)=n+1
==>tn=1/(n+1)
2023-11-21 05:46:14
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