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科目:高中數學
來源:不詳
題型:解答題
在數列
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中,前n項和為
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,且
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.
(Ⅰ)求數列

的通項公式;
(Ⅱ)設

,數列

前n項和為
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,求
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的取值范圍.
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科目:高中數學
來源:不詳
題型:解答題
(本小題滿分13分)已知等比數列
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滿足

.
(1)求數列

的前15項的和

;
(2)若等差數列
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滿足

,
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,求數列

的前
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項的和
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科目:高中數學
來源:不詳
題型:解答題
已知等差數列
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的前
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項和為
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,
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,且
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,
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.
(Ⅰ)求
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;
(Ⅱ)若

,求

的值和

的表達式
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科目:高中數學
來源:不詳
題型:填空題
在等差數列

中,
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,

,記數列

的前
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項和為
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,
(Ⅰ)數列

的通項
;
(Ⅱ)若

對

恒成立,則正整數

的最小值為
.
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科目:高中數學
來源:不詳
題型:填空題
已知無窮數列

具有如下性質:①

為正整數;②對于任意的正整數

,當
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為偶數時,
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;當

為奇數時,

.在數列
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中,若當
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時,
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,當
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時,
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(
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,
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),則首項
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可取數值的個數為
(用
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表示)
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