20-21高二下·浙江·期末
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1 . 下列命题为真命题的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题“若![]() ![]() |
D.命题“若![]() ![]() |
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2021-04-16更新
|
433次组卷
|
7卷引用:【新东方】双师232高二下
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2 . 下列说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.若“![]() ![]() ![]() ![]() |
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20-21高二·全国·单元测试
3 . 分别写出下列命题的逆命题、否命题、逆否命题.
(1)垂直于平面α内无数条直线的直线l垂直于平面α;
(2)设a,b,c,d是实数,若a=b,c=d,则a+c=b+d.
(1)垂直于平面α内无数条直线的直线l垂直于平面α;
(2)设a,b,c,d是实数,若a=b,c=d,则a+c=b+d.
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4 . 给出下列命题:
①命题“若
,则
,
全为
”的否命题是“若
,则
,
全不为
”;
②命题“已知
,若
,则
或
”的逆否命题是真命题;
③设
,则“
或
”是“
”的充分不必要条件;
④已知双曲线
的一条渐近线经过点
,则该双曲线的离心率为
.
其中是真命题的有( )
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb20e291772c2614ad19f4cc919dfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
②命题“已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34982de5d3f287cd570ea30eb46d185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be861d83cddb5fc8aa22f7f0f9415d6.png)
③设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515713922221bfa136afa32822bb7ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9745ec0409244fd87cecd954bc0a5e.png)
④已知双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
其中是真命题的有( )
A.①② | B.②④ | C.①③ | D.②③④ |
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5 . 下列有关命题的说法正确的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.命题“到两个定点的距离之和为定值的点的轨迹是椭圆”的逆命题是真命题 |
您最近一年使用:0次
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6 . 下列说法正确的个数为( )
①命题“若
则
”的逆命题为真命题;
②命题“若
且
,则
”的否命题为真命题;
③存在
,使得
;
④若正数
、
满足
,则
恒成立.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b702b9c4b5cf145dbac9abfeb1ed500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200849ce71f53c0321506e27de437b8d.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc34a2d14b2f914017ae7b2a15ab60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc94875835baa1d3c78b93a9ba46185.png)
③存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799b324b514d6044672c133d8fef2dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacc1bc98910bff2e05e7f94c593205b.png)
④若正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa1603dda1c5dc2c93b06688c2e9c04.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
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7 . 下列说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.设![]() ![]() ![]() ![]() |
C.若![]() |
D.命题“![]() ![]() ![]() ![]() |
您最近一年使用:0次
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8 . 下列选项叙述正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.已知i为虚数单位,复数z满足![]() ![]() |
C.若命题P:![]() ![]() ![]() ![]() |
D.“![]() ![]() |
您最近一年使用:0次
2021-02-09更新
|
61次组卷
|
2卷引用:江西省宜春中学、高安二中、上高二中、樟树中学、丰城中学2020-2021学年高三上学期五校联考数学(文)试题
9 . 给出下列四个命题:
①“若
,则
”的逆命题;
②“若数列
是等比数列,则
”的否命题;
③“若
,则关于x的方程
有实根”的逆命题;
④“若
,则
”的逆否命题.
其中真命题的个数是________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876e70d783ca1eece5c546f0ad708358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0ea3acd83c2a33956fe4b57bc4542c.png)
②“若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be02544e0fb9b80e2ce723bcc697da93.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56485f5459cbead897ee5f874f249c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e232f45482195a9500e067fe9f970af0.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ceb1f338fa60976229d7ec6531b626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf22d7d1a965bda25168a233fb6290c.png)
其中真命题的个数是
您最近一年使用:0次
10 . 下列说法正确的是( )
A.命题“若![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.“![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次