已知關(guān)于
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的不等式
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的解集為

.
(1)當(dāng)

時,求集合

;
(2)當(dāng)

時,求實數(shù)
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的范圍.
(1)
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(2)
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(1)當(dāng)a=1時,原不等式等價于不等式
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,然后再利用穿針引線法求其解集即可.
(2)題目條件
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可轉(zhuǎn)化為
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且

不成立.解然分別求出a的取值范圍,再求交集即可.
解:(1)當(dāng)
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時,

…4分
(2)

……………………6分



不成立.又

……8分



不成立


……9分
綜上可得,

……………………10分
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