1 . 下面命题正确的是( )
A."a>1"是"![]() |
B.命题“若![]() ![]() |
C.设x,y∈R,则“x≥2且y≥2"是“![]() |
D.设a,b∈R,则“a≠0”是“ab≠0”的必要不充分条件. |
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2 . 给出下列四个命题,其中真命题的个数是( )
①回归直线
恒过样本中心点
;
②“
”是“
”的必要不充分条件;
③“
,使得
”的否定是“对
,均有
”;
④“命题
”为真命题,则“命题
”也是真命题.
①回归直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5afb08619a0385cc26d0800291f52b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5a09b56fdf7d07245aecc586c9c84c.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfcffd48bd96e513072d998b69b6629.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc799452c14bb0903d848e2e1db2e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ea73577b2780c6b292408b496139a5.png)
④“命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d4eed113aa69a7d973c6410bae7ddf.png)
A.0 | B.1 | C.2 | D.3 |
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2017-04-28更新
|
561次组卷
|
6卷引用:四川省成都市龙泉中学2017-2018学年度高三上学期12月月考数学(文科)试题
名校
3 . 已知命题
;命题
;则下列命题为真命题的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54ae8d35cafa68cc8a11bab1cd31b4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1662d1506d1c25eed4f169d0119828f1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2017-11-16更新
|
386次组卷
|
5卷引用:四川省成都市郫都区2018届高三阶段测试(期中)数学(文)试题
名校
4 . 下列说法正确的是
A.命题“若![]() ![]() ![]() ![]() |
B.命题“![]() ![]() |
C.命题“若函数![]() ![]() ![]() |
D.“![]() ![]() ![]() |
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5 . 下列选项中,说法正确的是
A.“![]() ![]() |
B.若向量![]() ![]() ![]() ![]() |
C.若![]() ![]() |
D.命题![]() ![]() |
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6 . 命题“若
,则
”的否命题是.
![](https://img.xkw.com/dksih/QBM/2017/2/2/1619476799152128/1619476799283200/STEM/ba65bc6424104789891f1a165edb21e6.png)
![](https://img.xkw.com/dksih/QBM/2017/2/2/1619476799152128/1619476799283200/STEM/ab1934a0b86a446884b0ffcf3af20337.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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7 . 在实数集R中,我们定义的大小关系“>”为全体实数排了一个“序”.类似的,我们在平面向量集
上也可以定义一个称“序”的关系,记为“
”.定义如下:对于任意两个向量
,“
”当且仅当“
”或“
”.按上述定义的关系“
”,给出如下四个命题:
①若
,则
;
②若
,则
;
③若
,则对于任意
;
④对于任意向量
,若
,则
.
其中真命题的序号为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a965af9e5b642eac59f2cce02a66d66.png)
![](https://img.xkw.com/dksih/QBM/2014/12/26/1571936737443840/1571936743333888/STEM/b23a3e6395414191af332e0bc940a28c.png?resizew=23)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aed82593c7243215fb61bd72396407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa7079dfcebe900aa27605981e4a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2210f152080d9a68a97c805f5c1cde96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f088dba1c49a90372d33f199373f6ea7.png)
![](https://img.xkw.com/dksih/QBM/2014/12/26/1571936737443840/1571936743333888/STEM/b23a3e6395414191af332e0bc940a28c.png?resizew=23)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378d6b5612e51eacc7071a2e5cd9b09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364169e800302ecdbac0fc45931e9c22.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48bd5a837ffd88aba5eab249b43a206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7c5aa14174df024274c2ab8912f7b9.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa7079dfcebe900aa27605981e4a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd5cce0d8ba711ab80c4e0452ea9dc9.png)
④对于任意向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cd5ae1973dec0e19abf9a8cd08315c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa7079dfcebe900aa27605981e4a76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf62422562ca7208352128beb54f4e6.png)
其中真命题的序号为
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14-15高三上·四川成都·期中
8 . 下列说法正确的是
A.函数![]() ![]() |
B.函数![]() ![]() |
C.对于![]() ![]() ![]() ![]() ![]() |
D.对于指数函数![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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2013·四川成都·一模
9 . 已知命题p:“若直线
与直线
垂直,则
”;命题q:“
”是“
”的充要条件,则
![](https://img.xkw.com/dksih/QBM/2013/8/29/1571332578451456/1571332583424000/STEM/1642eef073234e0f9b2c98c5a33f85bb.png)
![](https://img.xkw.com/dksih/QBM/2013/8/29/1571332578451456/1571332583424000/STEM/33b198bfbc344ec2895f2f9e7fb3c4d9.png)
![](https://img.xkw.com/dksih/QBM/2013/8/29/1571332578451456/1571332583424000/STEM/5ef7c237736641c9907ec77b3e1799d2.png)
![](https://img.xkw.com/dksih/QBM/2013/8/29/1571332578451456/1571332583424000/STEM/aa3d623bc2984f7099dc858f0fc49a94.png)
![](https://img.xkw.com/dksih/QBM/2013/8/29/1571332578451456/1571332583424000/STEM/68b150d7d49744b9b2c5d42758cb17c5.png)
A.p真,q假 | B.“![]() | C.“![]() | D.“![]() |
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10 . 下列有关命题的说法正确的是
A.命题“若![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.命题“存在![]() ![]() ![]() ![]() |
D.命题“若![]() ![]() |
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