(請考生在題22,23,24中任選一題作答,如果多做,則按所做的第一題計分。)
(本小題滿分10分)設(shè)函數(shù)
(1)求函數(shù)
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的值域;
(2)若

,求

成立時

的取值范圍。
(1)

(2)

(1)

,
故

的值域?yàn)?img src="http://thumb.zyjl.cn/pic2/upload/papers/20140823/20140823141752719401.gif" style="vertical-align:middle;" />.………………………2分
(2)


,
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
,
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
,………………………4分
①當(dāng)

時,

,

,

.………………………6分

②當(dāng)

時,

,

,
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.………………………8分

③當(dāng)

時,

,

,

.
綜上,
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.………………………10分
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
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
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
,求證:

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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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