已知命題
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( )
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相關(guān)習(xí)題
科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本小題滿分14分)
已知m>0,設(shè)命題
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函數(shù)
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在
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上單調(diào)遞減;命題
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關(guān)于
x的不等式
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的解集為
R。若命題
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與
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有且僅有一個正確,求
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的取值范圍。
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科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
已知
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、
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是不重合的直線,a、b是不重合的平面,有下列命題:
①若
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a、
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∥b,則
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∥
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; ②若
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∥a、
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∥b,則a∥b;
③若a∩b=
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,
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∥
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,則
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∥a,
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∥b;④若
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⊥a,
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⊥b,則a∥b.
其中真命題的個數(shù)是
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科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
設(shè)m、n是兩條不同的直線,
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、
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是兩個不同的平面,下列命題正確的是
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科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本小題滿分12分)
已知命題
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:曲線
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為雙曲線;命題
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:函數(shù)
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在
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上是增函數(shù);若命題“
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或
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”為真,命題“
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且
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”為假,求實數(shù)
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的取值范圍.
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
. 已知集合
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,有下列命題
①若
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則
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;
②若
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則
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;
③若
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則
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的圖象關(guān)于原點對稱;
④若
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則對于任意不等的實數(shù)
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,總有
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成立.
其中所有正確命題的序號是
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
給出以下4個命題:
①曲線
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按
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平移可得曲線
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;
②若|
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-1|+|
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-1|
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,則使
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取得最小值的最優(yōu)解有無數(shù)多個;
③設(shè)
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、
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為兩個定點,
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為
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常數(shù),
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,則動點
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的軌跡為雙曲線;
④若橢圓的左、右焦點分別為
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、
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,
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是該橢圓上的任意一點,延長
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到點
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,使
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,則點
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的軌跡是圓.
其中所有真命題的序號為 .
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