函數(shù)
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在區(qū)間
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恰有2個零點,則
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的取值范圍是( )
試題分析:要滿足函數(shù)
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在區(qū)間
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恰有2個零點,需
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,所以
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。
點評:此題我們可以結合圖像來分析,這個更形象,更直觀。函數(shù)
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的周期公式為:
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;函數(shù)
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的周期公式為:
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。注意兩個函數(shù)周期公式的區(qū)別。
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在
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
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
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
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
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
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
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
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
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
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
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
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
,則當
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
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A. | B.1 | C.17 | D.25 |
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