設(shè)
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,則( )
試題分析:對A、B,設(shè)
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,這兩個函數(shù)都為增函數(shù),且
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時
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,所以
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的圖象在
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的上方,如圖,當(dāng)
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時,必有
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.所以選B.
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對C、D,設(shè)
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,
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.
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,所以
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在
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上單調(diào)遞減,在
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上單調(diào)遞增.
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,所以
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在
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上單調(diào)遞減,在
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上單調(diào)遞增.
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時
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,所以
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的圖象在
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的圖象上方.作出它們的圖象如圖所示,由圖可知
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的大小關(guān)系不定.
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