20.
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科目:高中數(shù)學
來源:不詳
題型:解答題
設數(shù)列
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滿足關系式:

(
p是常數(shù)).
(Ⅰ)求
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;
(Ⅱ)猜想

的通項公式,并證明.
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科目:高中數(shù)學
來源:不詳
題型:單選題
等差數(shù)列

中,
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,若數(shù)列

的前

項和為
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,則

的值為
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科目:高中數(shù)學
來源:不詳
題型:單選題
已知等差數(shù)列

的前
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項和為
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,且

,

,則數(shù)列

的通項公式為、
( )
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科目:高中數(shù)學
來源:不詳
題型:解答題
(本小題滿分12分)
已知數(shù)列

是首項為

,公比

的等比數(shù)列,設

,數(shù)列

滿足

.
(Ⅰ)求

的通項公式;
(Ⅱ)若

對一切正整數(shù)

恒成立,求實數(shù)

的取值范圍.
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科目:高中數(shù)學
來源:不詳
題型:單選題
下表給出一個“直角三角形數(shù)陣”滿足每一列成等差數(shù)列,從第三行起,每一行的數(shù)成等比數(shù)列,且每一行的公比相等,記第i行第j列的數(shù)為,則a
83等于( )
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科目:高中數(shù)學
來源:不詳
題型:單選題
設

是由正數(shù)組成的等差數(shù)列,

是由正數(shù)組成的等比數(shù)列,且

,
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,則必有 ( )
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科目:高中數(shù)學
來源:不詳
題型:單選題
設

是從
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這三個整數(shù)中取值的數(shù)列. 若
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且
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, 則
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當中取零的項共有( )
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