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1 . 命题“若
,则
”的逆命题是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d782efdac56b5359072e8602fff34357.png)
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2020-02-12更新
|
437次组卷
|
6卷引用:安徽省六安市舒城中学2020-2021学年高二上学期第三次月考数学(文)试题
2 . 设
为正实数,现有下列命题:
①若
,则
; ②若
,则
.
③若
,则
;④
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb79d4f3f5d9b49cf11a046e10d3f6.png)
⑤
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0f8ed88b7905a7f2a0c995c5650438.png)
其中真命题有( )个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88592d9e21b5201fe1c5f39bf240845e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb9c7fcfa0915ac93afa4273ea66178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7337cbb1a84fce3507a5e85b8d3ec2af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb9c7fcfa0915ac93afa4273ea66178.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91d326e4306f2bb26b03e187857ac2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04959523a28786962d51cfb43a8767d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb79d4f3f5d9b49cf11a046e10d3f6.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce30151be6d62fbdbc0e3d9d260cf63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0f8ed88b7905a7f2a0c995c5650438.png)
其中真命题有( )个
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 下列结论中错误的是( )
A.命题“若![]() ![]() ![]() ![]() ![]() ![]() |
B.命题![]() ![]() ![]() |
C.命题“若![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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2020-01-14更新
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532次组卷
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3卷引用:安徽省六安市霍邱县第二中学2019-2020学年高二(美术班)下学期开学考试数学试题
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4 . 下列说法错误的是( )
A.对于命题![]() ![]() ![]() ![]() ![]() ![]() |
B.“![]() ![]() |
C.若命题![]() ![]() ![]() |
D.命题“若![]() ![]() ![]() ![]() |
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2020-01-06更新
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351次组卷
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4卷引用:安徽省六安市金安区第一中学2019-2020学年高二上学期期末数学(理)试题
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5 . 已知命题甲:关于
的不等式
的解集为全体实数R,命题乙:方程
有两个不相等的实根.
(1)若甲、乙都是真命题,求实数
的取值范围;
(2)若甲、乙中至少有一个是真命题,求实数
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e757320d3b5fcbe092abf04c96d638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcdc69fd19fdbd26b0c65ffd341600.png)
(1)若甲、乙都是真命题,求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若甲、乙中至少有一个是真命题,求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2019-12-04更新
|
321次组卷
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2卷引用:安徽省六安市舒城中学2019-2020学年高二上学期期末数学(理)试题
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6 . 下列命题正确的个数是
①命题已知
或
,
,则
是
的充分不必要条件;
②“函数
的最小正周期为
”是“
”的必要不充分条件;
③
在
上恒成立
在
上恒成立;
④“平面向量
与
的夹角是钝角”的充要条件是“
”
⑤命题
函数
的值域为
,命题
函数
是减函数.若
或
为真命题,
且
为假命题,则实数
的取值范围是
.
①命题已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cae928a28e73a9896053ed6f671cec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d69bdbf63ae27dadfc19395466c6592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eabba10945a279563acee17c3292a06b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
②“函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72aaf02b68c3a85f563f6fdf3f6049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e871c54f8021e1f0da4d552e38d8814f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53224898de85a85058ad336490bbbaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59aa66ce19b64665ba99e4aee00887f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53224898de85a85058ad336490bbbaa7.png)
④“平面向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9681ac38f9abc36de80c08859e680297.png)
⑤命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09928991d12369c93f2908af03573626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01c2825061379274303984566b6860a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
A.1 | B.2 | C.3 | D.4 |
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7 . 下列命题中:
①“
”是“
”的充要条件;
②已知随机变量
服从正态分布
,则
;
③线性回归直线方程
一定经过样本中心
;
④命题“
”的否定是“
”.
其中正确的个数是( )
①“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552d996f4748a1c0d22149f9ead89f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8073266cfa99b04190473d16b615a8.png)
②已知随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265760791e5206fee04ee2d18b4347d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19aceb5b182450d7456847ab3cc3faab.png)
③线性回归直线方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7daef33ceecceef13923ee58b7ee5a.png)
④命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad898ac9ddff9fe7deddf6cd26e0e109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecb65417f402ab00281d551cd770bf8.png)
其中正确的个数是( )
A.1 | B.2 | C.3 | D.4 |
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8 . 下列有关命题的说法正确的是___ (请填写所有正确的命题序号).
①命题“若
,则
”的否命题为:“若
,则
”;
②命题“若
,则
”的逆否命题为真命题;
③条件
,条件
,则
是
的充分不必要条件;
④已知
时,
,若
是锐角三角形,则
.
①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/0e30c903d8f8a05332af0b19e7e40df3.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce22028b0472ba0c4db9c3179e963ad2.png)
③条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c6b1aa287ff58292b8ca13167a7423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c829d368dd8162aba35c5950d2a9e781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6c850df0d8e728fc545044cdd6a0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a673984ab88416f50a8496242427cdbe.png)
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2019-08-22更新
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1013次组卷
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9卷引用:安徽省六安二中河西校区2018-2019学年高三上学期第三次统测文科数学试题
安徽省六安二中河西校区2018-2019学年高三上学期第三次统测文科数学试题【全国百强校】江苏省清江中学2018届高三学情调研考试数学试题【全国百强校】宁夏石嘴山市第三中学2019届高三上学期期末考试数学(文)试题(已下线)专题2 常用逻辑用语(讲)-《2020年高考一轮复习讲练测》(江苏版)(已下线)专题2 常用逻辑用语(练)-《2020年高考一轮复习讲练测》(江苏版)(已下线)专题1.2 命题及其关系、逻辑联结词、充分条件与必要条件-《2020年高考一轮复习讲练测》(浙江版)(练)辽宁师范大学附属中学2018-2019学年高三上学期第一次模块考试数学(理)试题甘肃省甘南藏族自治州合作第一中学2018-2019学年高二下学期期末考试数学(文)试题(已下线)黄金卷04(2024新题型)
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9 . 以下说法错误的是
A.命题“若![]() ![]() ![]() ![]() |
B.“![]() ![]() |
C.若命题![]() ![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2019-04-28更新
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1784次组卷
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6卷引用:安徽省六安市舒城中学2018-2019学年高二上学期第四次统考数学(理)试题
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10 . 已知命题p:若
为锐角三角形,则
;命题
,若
,则
或
.则下列命题为真命题的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0d0d3f2249419ecbc4fb4e0ed842c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98444489b6ceee1fa41c564a73d33cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8350f7a87dbbabe5ddc5b2decadfc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f57ba13f481a34bc1f29851b061e00a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4946441a547e1fe3fa4c06df14728b22.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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