(本小題10分)函數(shù)
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是偶函數(shù).
(1)求
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;
(2)將函數(shù)
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的圖像先縱坐標(biāo)不變,橫坐標(biāo)縮短為原來的
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倍,再向左平移
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個單位,然后向上平移1個單位得到
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的圖像,若關(guān)于
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的方程
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有且只有兩個不同的根,求
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的范圍.
(1)
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(2)
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(1)
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,而
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為偶函數(shù),則
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即
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(2)
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可化為
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作出
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的圖像,數(shù)形結(jié)合可知,
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(
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(1)當(dāng)
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時,求
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(2)若
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,將
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
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