(本小題共12分)
已知函數(shù)
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(Ⅰ)求
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的值;
(Ⅱ)求

的最大值和最小值
(1)
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=
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(2)
當(dāng)
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時

取最大值2;
當(dāng)

時,

取最小值-1
解:(Ⅰ)

=
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(Ⅱ)
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
因為

,所以,當(dāng)

時

取最大值2;
當(dāng)

時,

取最小值-1
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
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
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
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
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
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