已知
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<
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<0,①
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>
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;②
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>
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;③
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>
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;④
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<
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,上述不等式中正確的個數(shù)為( )
因為
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<
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<0,利用不等式的性質(zhì)借這股,倒數(shù)性質(zhì)成立,命題
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>
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成立。
同時
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>
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成立,
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>
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結(jié)合二次函數(shù)圖像可知成立,
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<
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錯誤。選C
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
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