設
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,函數(shù)

的值域為
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.若
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,則

的取值范圍是
.
試題分析:因為
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在
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上是增函數(shù)且值域為
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,所以
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時,

的范圍為

;因為
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在
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上是減函數(shù)且值域為

,所以

時,
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的范圍為
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,
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的值域為
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,且
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,所以有
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.即
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的取值范圍為
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.
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
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