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If a(n)=[img]2022m10x/ct_ve01203002j_egreqjs_0175_221020[/img],a(1)=8,which of t
If a(n)=[img]2022m10x/ct_ve01203002j_egreqjs_0175_221020[/img],a(1)=8,which of t
游客
2024-01-13
45
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问题
If a(n)=
,a(1)=8,which of the following is a(501)?
选项
A、8
B、7/8
C、1/8
D、8/7
E、4
答案
A
解析
a(1)=8,根据通项公式得到a(2)=8/7,a(3)=8,a(4)=8/7,a(5)=8,我们发现这个序列其实是8,8/7,8,8/7,8,…的重复数列,数列的奇数项是8,偶数项是号,第501项是奇数项,因此a(501)=8,所以A为正确答案。
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