设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数证明:对一切正整数n,有1/a1+1/a2+...1/an

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设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数证明:对一切正整数n,有1/a1+1/a2+...1/an

设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数证明:对一切正整数n,有1/a1+1/a2+...1/an
设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数
证明:对一切正整数n,有1/a1+1/a2+...1/an

设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数证明:对一切正整数n,有1/a1+1/a2+...1/an
3^n-2^n-3^(n-1)
=2*3^(n-1)-2^n
=2*(3^(n-1)-2^(n-1))>0
∴an=3^n-2^n>3^(n-1),
∴1/an

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