数列,,满足:,,.
(1)若数列是等差数列,求证:数列是等差数列;
(2)若数列,都是等差数列,求证:数列从第二项起为等差数列;
(3)若数列是等差数列,试判断当时,数列是否成等差数列?证明你的结论.
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数列,,满足:,,.
(1)若数列是等差数列,求证:数列是等差数列;
(2)若数列,都是等差数列,求证:数列从第二项起为等差数列;
(3)若数列是等差数列,试判断当时,数列是否成等差数列?证明你的结论.
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