已知數(shù)列
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中,
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,且
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,則數(shù)列
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的前100項和為( )
可知數(shù)列
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和數(shù)列
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是以1為首項,1為公差的等差數(shù)列,所以
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.
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科目:高中數(shù)學
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題型:解答題
已知函數(shù)
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, 若數(shù)列
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(n∈N*)滿足:
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,
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(1) 證明數(shù)列
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為等差數(shù)列,并求數(shù)列
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的通項公式;
(2) 設數(shù)列
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滿足:
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,求數(shù)列
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的前n項的和
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.
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科目:高中數(shù)學
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(本題滿分9分)已知數(shù)列
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滿足
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(1)求數(shù)列
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的通項公式;(2)若數(shù)列
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滿足
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,求數(shù)列
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的通項公式;(3)若
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,求數(shù)列
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的前
n項和
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科目:高中數(shù)學
來源:不詳
題型:解答題
.(本題滿分14分)已知數(shù)列
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的前
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項和為
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,且
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.
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若數(shù)列
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為等比數(shù)列,求
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的值;
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若
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,數(shù)列
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前
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項和為
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,
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時
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取最小值,求實數(shù)
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的取值范圍.
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科目:高中數(shù)學
來源:不詳
題型:解答題
(14分)已知等比數(shù)列
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的前
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項和為
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,且
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是
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與2的等差中項,
等差數(shù)列
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中,
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,點
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在直線
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上.
⑴求
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和
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的值;
⑵求數(shù)列
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的通項
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和
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;
⑶ 設
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,求數(shù)列
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的前n項和
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.
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科目:高中數(shù)學
來源:不詳
題型:單選題
設S
n是等差數(shù)列
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的前n項和,若
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( )
A.1 | B.-1 | C.2 | D. |
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