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1 . 下列命题中为真命题的是( )
A.命题“若![]() ![]() | B.命题“若![]() ![]() |
C.命题“若![]() ![]() | D.命题“若![]() ![]() |
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解题方法
2 . 下列四个命题中为真命题的是( )
A.若![]() ![]() |
B.若命题![]() ![]() |
C.设![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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3 . 下列命题错误的是
A.命题“若![]() ![]() ![]() ![]() |
B.命题“![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.“若![]() ![]() |
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2017-11-14更新
|
833次组卷
|
9卷引用:【全国百强校】宁夏平罗中学2019届高三第五次模拟(最后一模)考试数学(文)试题
【全国百强校】宁夏平罗中学2019届高三第五次模拟(最后一模)考试数学(文)试题辽宁省普兰店市第一中学2019届高三上学期期中考试数学(理)试题辽宁省普兰店市第一中学2019届高三上学期期中考试数学(文)试题内蒙古自治区乌兰察布市集宁一中2019年高三上学期期中数学(理)试题辽宁省大连渤海高级中学2017-2018学年高二上学期期中考试数学(文)试题河南省郑州市第一中学网校2017-2018学年高二上学期期中联考数学(文)试题江西省樟树中学2017-2018学年高二下学期第三次月考数学(文)试题【全国百强校】新疆乌鲁木齐市第七十中学2018-2019学年高二下学期第一次月考数学(文)试题安徽省滁州市定远县育才学校2019-2020学年高二下学期期末数学(文)试题
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4 . 下列推断错误的个数是
①命题“若
,则
”的逆否命题为“若
则
”
②命题“若
,则
”的否命题为:若“
,则
”
③“
”是“
”的充分不必要条件
④命题“
,使得
”的否定是:“
,均有
”.
①命题“若
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/e1b49cd705fe4436a7d8757723bd5867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9741a2fca27f76be9834659c28fc6783.png)
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/741cbf07664f498ab8192c395a475ce9.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9741a2fca27f76be9834659c28fc6783.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cd8b0be2229425e6eaa6c0aed2e062.png)
![](https://img.xkw.com/dksih/QBM/2016/10/12/1573065985245184/1573065991069696/STEM/11a67fcf991f4df7b0f40d69ba0ea438.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786921d44625369b0e89c3020f41fb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a44a53f07fb4e9af02564cfea7671dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d05bfb81fb639a2697789174ac6f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a44a53f07fb4e9af02564cfea7671dc.png)
A.1 | B.2 | C.3 | D.4 |
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2016-12-04更新
|
783次组卷
|
5卷引用:宁夏银川一中2022届高三上学期第一次月考数学(理)试题
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5 . 给出下列四个命题:
①若样本数据
的方差为
,则数据
的方差为
;
②“平面向量
的夹角为锐角,则
”的逆命题为真命题;
③命题“
,均有
”的否定是“
,均有
”;
④
是直线
与直线
平行的必要不充分条件.
其中正确的命题个数是
①若样本数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c6f22f18cae8604db3059650bb3e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c748e40ba21ac5063d3bccaa57ef278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13c2d7d34ab8b09bb20029d0854338f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332e71982612ea86c28b9f2054b1045c.png)
②“平面向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1e552a1451270703a86e592d7dd656.png)
③命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000611ae296699aedc383b220c0dc155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4da71f6e584c818c2602a49d4a38511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4db4774dcee98eae6ddc2def943187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65798f1a466b5f5d3d407c00b821b4a.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e54f7af574f7841441313ce7314b16f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea73dc274ba04520a207eff0998c2ed3.png)
其中正确的命题个数是
A.![]() | B.![]() | C.![]() | D.![]() |
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2018-06-19更新
|
430次组卷
|
4卷引用:【全国百强校】宁夏回族自治区银川一中2018届高三第三次模拟考试数学(理)试题
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6 . 下列命题错误的个数是( )
①在
中,
是
的充要条件;
②若向量
满足
,则
与
的夹角为钝角;
③若数列
的前
项和
,则数列
为等差数列;
④若
,则“
”是“
”的必要不充分条件.
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
②若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8139fb7861111f2a99f559d72f829e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
③若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b8c236da8cf6588d3f31e2461543b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e39ed1fa73c58f8614ab27edb32699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
A.1 | B.2 | C.3 | D.4 |
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7 . 下列结论中正确的是( )
A.命题“若x2-3x+2=0,则x=1”的否命题是“若x2-3x+2=0,则x≠1” |
B.命题p:存在x0∈R,sin x0>1,则 p:任意x∈R,sin x≤1 |
C.若p且q为假命题,则p、q均为假命题 |
D.“x2+2x-3<0”是命题. |
您最近一年使用:0次
2018-11-06更新
|
359次组卷
|
2卷引用:宁夏银川市贺兰县第二高级中学2023届高三上学期期末考试数学(理)试题
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8 . 下列共用四个命题.
(1)命题“
,
”的否定是“
,
”;
(2)在回归分析中,相关指数
为
的模型比
为
的模型拟合效果好;
(3)
,
,
,则
是
的充分不必要条件;
(4)已知幂函数
为偶函数,则
.
其中正确的序号为_________ .(写出所有正确命题的序号)
(1)命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03edd85c55c93a3e34d3477d7e04f731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aec0693231f71fc10f820c41823dd37.png)
(2)在回归分析中,相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be68b3aa1b5022969487c0bb8aad2c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085ce2eeb0eb35af515d1ecd8ebaa610.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd15a98f5f7c568023a3db60c2e1de2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0029379a0e2f8595cfb343a5c03f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(4)已知幂函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eb7ed9690c65a9fbfe0441af5f0b26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba24ca9648a13438daa6da7a10073163.png)
其中正确的序号为
您最近一年使用:0次
2017-05-26更新
|
851次组卷
|
4卷引用:宁夏石嘴山市第三中学2019-2020学年高三第四次高考适应性考试数学(理)试题
9 . 下列命题:
①“若
,则
”的否命题;
②“函数
的图象在
轴的上方”是“
”的充要条件;
③“若
为有理数,则
为无理数”的逆否命题.
其中真命题的个数为( )
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798d6c2e5eac9c1d8b044efd5081acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
②“函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24f1e4d0f5084cc4d867ee1a8fcf357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7326ea56be82bd616fec7e6aa3c884c8.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef34a95bb58c5676d57e1db23f64ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
其中真命题的个数为( )
A.0 | B.1 | C.2 | D.3 |
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解题方法
10 . 给出下列四个命题:
①函数
在区间
上存在零点;
②要得到函数
的图象,只需将函数
的图象向左平移
个单位;
③若
,则函数
的值城为
;
④“
”是“函数
在定义域上是奇函数”的充分不必要条件;
⑤已知
为等差数列,若
,且它的前
项和
有最大值,那么当
取得最小正值时,
.其中正确命题的序号是__________ .
①函数
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/b655d38549164c59867e4d94f11efbf9.png?resizew=123)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/ca3f752bcf854500974df6886ea07ed3.png?resizew=33)
②要得到函数
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/1c506a857054489398014631f620cd51.png?resizew=60)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/9c4032b78d644143a0c093275a3c2e15.png?resizew=100)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/217a53c36c1548d39db4776d87a14273.png?resizew=17)
③若
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/fc30550d834440bf91b46764b7ee93e6.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/c953890882964091925a6dd58efe9010.png?resizew=147)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/e3632ed30eea4f01be8ada8724df1b6c.png?resizew=16)
④“
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/03c5799884d24399b59dd689fa28ef2b.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/a22c093efd764e6dbf7b10778fb7880a.png?resizew=99)
⑤已知
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/92e7343367f643538d2e52e9e1a17f8e.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/a8a5d096fbd94c3db20a523e15f189a3.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/79cbaae30a334e02bc78edde95a391f4.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/9f0c88d142c7417696efbc94d173a456.png?resizew=20)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/9f0c88d142c7417696efbc94d173a456.png?resizew=20)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572418545074176/1572418551136256/STEM/3a62d34c81254643ade5ea42e8981bf5.png?resizew=47)
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