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已知已知函数,数列{an}满足a1=1,an+1=f(an)(n∈N*).(Ⅰ)求证:数列...
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已知已知函数
,数列{a
n}满足a
1=1,a
n+1=f(a
n)(n∈N
*).
(Ⅰ)求证:数列
是等差数列;
(Ⅱ)记S
n=a
1a
2+a
2a
3+…+a
na
n+1,试比较2S
n与1的大小.
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