已知數(shù)列
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是首項為
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,公差為1的等差數(shù)列,數(shù)列
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滿足
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.若對任意的
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, 都有
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成立, 則實數(shù)
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的取值范圍是( )
解:因為數(shù)列
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是首項為
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,公差為1的等差數(shù)列,數(shù)列
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滿足
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.若對任意的
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, 都有
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成立, 則實數(shù)
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的取值范圍是
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,選A
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已知數(shù)列
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滿足
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=-1,
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,數(shù)列
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滿足
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(1)求證:數(shù)列
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為等比數(shù)列,并求數(shù)列
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的通項公式.
(2)求證:當
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時,
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(3)設(shè)數(shù)列
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的前
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項和為
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,求證:當
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時,
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的通項公式;(3)若
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