2011·河南开封·三模
1 . 下列命题中,所有正确命题的个数为( )
①命题“若
”的逆命题是真命题;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3661a41c4e5898c3c66088dfc50361.png)
③若随机变量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04bfc082557c9904e79600097a58a53.png)
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d0514091954093836e8bc6d590d597.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3661a41c4e5898c3c66088dfc50361.png)
③若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04bfc082557c9904e79600097a58a53.png)
A.0 | B.1 | C.2 | D.3 |
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2 . 下列命题中:
①命题“若
,则
”的否命题为“若
,则
”;
②命题“若方程
,则m>4”的逆命题为真命题;
③对命题p和q,“p且q为假”是“p或q为假”的必要不充分条件.
假命题的序号为_________ .
①命题“若
![](https://img.xkw.com/dksih/QBM/2015/3/17/1572009339060224/1572009344901120/STEM/52c9bba498d84eb18f4ae2b5ef1ea715.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://img.xkw.com/dksih/QBM/2015/3/17/1572009339060224/1572009344901120/STEM/52c9bba498d84eb18f4ae2b5ef1ea715.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
②命题“若方程
![](https://img.xkw.com/dksih/QBM/2015/3/17/1572009339060224/1572009344901120/STEM/63dcecdf7b674a35a69c0f11ace52351.png?resizew=96)
③对命题p和q,“p且q为假”是“p或q为假”的必要不充分条件.
假命题的序号为
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3 . 下列命题中,正确的是 .
A.存在![]() ![]() |
B.“![]() ![]() |
C.若![]() ![]() |
D.若函数![]() ![]() ![]() ![]() ![]() |
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2016-12-03更新
|
238次组卷
|
4卷引用:2016届河南省信阳高中高三上第八次大考理科数学试卷
2010·河南·一模
4 . 下列四个命题中的真命题为
A.![]() | B.![]() |
C.![]() | D.若![]() |
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2011·河南商丘·二模
5 . 下列四个命题:
①(x
2)5的展开式共有6项;
②设回归直线方程为
2﹣2.5x,当变量x增加一个单位时,y平均增加2.5个单位;
③已知ξ服从正态分布N(0,σ2),且P(﹣2≤ξ≤0)=0.4,则P(ξ>2)=0.2;
④已知函数f(a)
,则f[f(
)]=1﹣cos1.
其中正确命题的个数为( )
①(x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9f5382c99cd889c4e25670f5e8c06f.png)
②设回归直线方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8481c83049516c6dc9cf2d2fef74b5a.png)
③已知ξ服从正态分布N(0,σ2),且P(﹣2≤ξ≤0)=0.4,则P(ξ>2)=0.2;
④已知函数f(a)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1140eca6fd39383afd103bddfb49c336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de12bbd5097debc83d6a46364589748.png)
其中正确命题的个数为( )
A.4 | B.3 | C.2 | D.1 |
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6 . 下列命题中,正确的是
A.存在x0>0,使得x0<sinx0 |
B.“lna>lnb”是“10a>10b”的充要条件 |
C.若sinα≠![]() ![]() |
D.若函数f(x)=x3+3ax2+bx+a2在x=﹣1有极值0,则a=2,b=9或a=1,b=3 |
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2011·河南商丘·二模
7 . 下列命题错误的
A.命题“若lnx=0,则x=1”的逆否命题为“若x≠1,则lnx≠0” |
B.“x>2”是“![]() ![]() |
C.命题p:![]() ![]() ![]() |
D.若p∧q为假命题,则p,q均为假命题 |
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2013·陕西榆林·模拟预测
8 . 命题
:函数
(
且
)的图像恒过点
;命题
:函数
有两个零点. 则下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca9679cf9afec37d78b055db69ed5cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d281e837adac1f8bf88a944e106aa305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b802c0b075f8ce21a494dde744dd0e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68d6eef91eebb3590e5164b5e9a9a9a.png)
A.“![]() ![]() | B.“![]() ![]() |
C.![]() | D.![]() |
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2012·河南·二模
9 . 下列命题中正确命题的个数是
(1)命题“若
,则x = 1”的逆否命题为“若x ≠ 1则
”;
(2)设回归直线方程
=1+2x中,
x平均增加1个单位时,
平均增加2个单位 ;
(3)若
为假命题,则
均为假命题 ;
(4)对命题
:
使得
,则![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/8002d6e1e3234db0bf7538234d002c81.png)
均有
;
(5)设随机变量
服从正态分布N(0,1),若
,则![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/fac6c437a69c4bf2a716dc3ccff4b78a.png)
(1)命题“若
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/63d49c3c14334b0c95a141cd485e356a.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/bb0d24ce6411429d8dd9e0a785896ab7.png)
(2)设回归直线方程
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/6ab8d376d6594d7480d5d5f5fa76bfd8.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/fc26021acd574ba0a6a94bf04b32d913.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/c0bd80dbb52f4961ab1809bf4bea8f8d.png)
(3)若
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/b4c0579d9cfc41178781971c9b6a39ad.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/d27de9c69dc1468abbb37f1d98737e22.png)
(4)对命题
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/bd81a334397346fa8e99ccecaa6ec508.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/6fd984e74c6c461bab48e41d564d41f1.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/93cf682f1c1b41aaa90fedf0cd33f91b.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/8002d6e1e3234db0bf7538234d002c81.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/715815b546ac4ddc814e93024a596717.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/cc1ff9946c9c440bb3ffa4f238a20cd8.png)
(5)设随机变量
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/6dd496e7b56b4f7590a5802429f79d26.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/9c4e04facdf54d63bf367639bf3cb144.png)
![](https://img.xkw.com/dksih/QBM/2012/4/5/1570829341966336/1570829347069952/STEM/fac6c437a69c4bf2a716dc3ccff4b78a.png)
A.2 | B.3 | C.4 | D.5 |
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