设b大于0,数列an满足a1=b,an=nb(an-1)/(an-1)+n-1.
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设b大于0,数列an满足a1=b,an=nb(an-1)/(an-1)+n-1.
(1)求an通项公式.(2)证明:对于一切正整数n,2an小于等于b的n+1次方+1.
(1)求an通项公式.(2)证明:对于一切正整数n,2an小于等于b的n+1次方+1.
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题中的 an=nb(an-1)/(an-1)+n-1是不是说可以化简得an=nb(an-1)/(an-1)+n-1=nb+n-1
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