設(shè)公差不為
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的等差數(shù)列
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的前
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項(xiàng)和為
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,且
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,則下列數(shù)列不是等比數(shù)列的是( )
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科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
已知數(shù)列
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滿足
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(1) 求
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
(2) 求數(shù)列
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的前
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項(xiàng)和
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
已知一個等差數(shù)列的前三項(xiàng)分別為

,則它的第五項(xiàng)為
.
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題

為等差數(shù)列,若
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,則使前

項(xiàng)
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的最大自然數(shù)

是
.
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科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本題16分)
已知公差不為0的等差數(shù)列{
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}的前4項(xiàng)的和為20,且

成等比數(shù)列;
(1)求數(shù)列{

}通項(xiàng)公式;(2)設(shè)

,求數(shù)列{
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}的前n項(xiàng)的和
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;
(3)在第(2)問的基礎(chǔ)上,是否存在
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
使得
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成立?若存在,求出所有解;若不存在,請說明理由.
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科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
在數(shù)列

中,
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,設(shè)
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(1)證明數(shù)列

是等差數(shù)列,并求其通項(xiàng)公式;
(2)求所有正整數(shù)

的值,使得

中某個連續(xù)

項(xiàng)的和是數(shù)列

中的第8項(xiàng).
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科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
規(guī)定一種運(yùn)算﹠:
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﹠
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=
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,
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﹠
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
﹠
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,則
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﹠
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的值為( )
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
已知等差數(shù)列

的前
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項(xiàng)和為
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,
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,則
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的最大值是
.
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