設(shè)偶函數(shù)
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對任意
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,都有
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,當(dāng)
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時,
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,則
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( )
本題考查函數(shù)的奇偶性,周期性及推理能力.
因為
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對任意
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,都有
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所以
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所以函數(shù)
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是周期為2的周期函數(shù);則
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,又函數(shù)
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是偶函數(shù),且
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時,
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所以
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.故選A
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,函數(shù)
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成立的
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(Ⅱ)當(dāng)

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
在閉區(qū)間
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上的函數(shù)
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上單調(diào)增.
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在
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(2)若
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