不等式選講
已知
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均為正實數(shù),且
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.求
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的最大值.
由柯西不等式得
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…
當(dāng)且僅當(dāng)a=b=c=
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時等號成立 故
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的最大值為
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若
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且
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,則下列不等式成立的是 ( )
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若
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,則下列不等式:①

;②

;③

;④
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中,正確的不等式有( * )
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已知實數(shù)
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滿足
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,目標(biāo)函數(shù)
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的最小值和最大值分別為
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和
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,則
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的值為
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若不等式
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上恒成立,則實數(shù)a的取值范圍為_
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設(shè)
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是正數(shù),且
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,
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,則
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與
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的大小關(guān)系是
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.
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定義在
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上的函數(shù)
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,當(dāng)
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若
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,則P,Q,R的大小關(guān)系為
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設(shè)不等式
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的解集為
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,若
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,則實數(shù)
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