“矩形的對角線相等”可以理解為“任意矩形的對角線相等”,則其否定是“存在矩形,其對角線不相等”
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科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
下列4個命題:(1)命題“若
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,則
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”;
(2)“
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”是“對任意的實數(shù)
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,
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成立”的充要條件;
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(3)設(shè)隨機變量
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服從正態(tài)分布N(0,1),若
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;
(4)命題“
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,
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”的否定是:“
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,
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”
其中正確的命題個數(shù)是( )
A.1 | B.2 | C.3 | D.4 |
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
給出以下命題:①命題“
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”的否定是“
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”;
②若
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則
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;
③設(shè)圓
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與坐標(biāo)軸4個交點,分別為
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,
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,
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,
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,則
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;
④“
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”是“直線
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與直線
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相互垂直”的必要不充分條件。
其中真命題是:
(寫出所有你認(rèn)為正確的命題序號)
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科目:高中數(shù)學(xué)
來源:不詳
題型:單選題
已知命題P:
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n∈N,2
n>1000,則
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p為
A. n∈N,2n>1000 | B. n∈N,2n≤1000 |
C. n∈N,2n≤1000 | D. n∈N,2n<1000 |
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
寫出命題“已知
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,如果
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是減函數(shù),則
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”的否命題:
.
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科目:高中數(shù)學(xué)
來源:不詳
題型:填空題
已知命題P:“對
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∈R,
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m∈R,使
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”,若命題
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是假命題,則實數(shù)m的取值范圍是_________。
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科目:高中數(shù)學(xué)
來源:不詳
題型:解答題
(本題滿分12分)已知命題
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函數(shù)
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的定義域是R;命題
q:方程
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有兩個不相等的實數(shù)解,若“
p且非
q”為真,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
給出下列四個命題中:
①命題“
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”的否定是“
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”;
②“
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”是“直線
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與直線
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相互垂直”的充分不必要條件;
③設(shè)圓
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與坐標(biāo)軸有4個交點,分別為
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,則
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;
④關(guān)于
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的不等式
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的解集為
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,則
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.
其中所有真命題的序號是
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