短道速滑队组织6名队员(包括赛前系列赛积分最靠前的甲乙丙三名队员)参加冬奥会选拔赛,记“甲得第一名”为
,“乙得第二名”为
,“丙得第三名”为
,若
是真命题,
是假命题,
是真命题,则选拔赛的第一名为______ .(请用“甲,乙,丙”作答)
![](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/11bc05f41215f9894e11d1df0465751a.png)
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20-21高二上·黑龙江双鸭山·阶段练习 查看更多[2]
黑龙江省双鸭山市第一中学2020-2021学年高二上学期第二次月考数学(理)试题(已下线)专题9 《集合与常用逻辑用语》综合测试卷 - 2021-2022高一上学期数学新教材配套提升训练(人教B版2019必修第一册)
更新时间:2021-01-31 08:09:42
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【知识点】 根据或且非命题的真假判断命题的真假解读
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【推荐1】下列命题中,正确的个数是__________ .(1)已知
,则“
”是“
”的充分不必要条件;(2)已知
,则“
”是“
”的必要不充分条件;(3)命题“p或q”为真命题,则“命题p”和“命题q”均为真命题;(4)命题“若
,则
”的逆否命题是真命题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
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【推荐2】下列命题中假命题的序号为_________ .
①命题“若
,则
”的否命题为“若
,则
”;
②命题“若方程
有解,则
”的逆命题为真命题;
③对命题
和
,“
且
为假”是“
或
为假”的必要不充分条件.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
②命题“若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81957ddb1efc626e09276b7c6ba793a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71badab736269c6567a3977823e2f9b1.png)
③对命题
![](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/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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