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科目:高中数学
来源:不详
题型:解答题
(本小题满分12分)已知数列
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满足
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(Ⅰ)求数列
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的通项公式;
(Ⅱ)若数列
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满足
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,证明:
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是等差数列;
(Ⅲ)证明:
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科目:高中数学
来源:不详
题型:解答题
等差数列
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的前
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项和记为
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,已知
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.
(1)求数列

的通项
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;
(2)若
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,求
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;
(3)令
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,求证:数列
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为等比数列.
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科目:高中数学
来源:不详
题型:解答题
(本小题满分13分)
在数列
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。
(1)求证:数列
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是等差数列,并求数列

的通项公式;
(2)设
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科目:高中数学
来源:不详
题型:解答题
(本题满分12分)
已知数列
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的前
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
项和为
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,且
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(1)求
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的值;
(2)猜想
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的表达式,并用数学归纳法加以证明。
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科目:高中数学
来源:不详
题型:单选题
如果等差数列
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中,
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+
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+
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=12,那么
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+
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+…+
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=" " ( )
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科目:高中数学
来源:不详
题型:单选题
设
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, 则对任意正整数
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, 都成立的是( )
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