名校
1 . 有下列四种说法:①
,
均成立;②若
是假命题,则
,
都是假命题;③命题“若
,则
”的逆否命题是真命题;④“
”是“直线
与直线
互相垂直”的充分条件.其中正确的命题有__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ef006e1364f2e480c8d1c70ed05077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.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/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13abf1d7298444627d32294dca2f005b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289ce704ab8d876aa9756cf3ae972a2e.png)
您最近一年使用:0次
名校
2 . 给下列三个结论:
①命题“
”的否定是“
”;
②若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a32252c7ec305d321d8c1888cf2e070.png)
,则
的逆命题为真;
③命题“若
,则
”的否命题为:“若
,则
”;
其中正确的结论序号是_______________ (填上所有正确结论的序号).
①命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca4ca1588eba01b231315b1c7d20a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bfe039612ffb5d60214d5d6045f4a.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a32252c7ec305d321d8c1888cf2e070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d7b4bb12628d5ed455d814b8aafa1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
③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)
其中正确的结论序号是
您最近一年使用:0次
2019-02-02更新
|
586次组卷
|
3卷引用:江西省宜春市上高二中2019-2020学年高二上学期第二次月考数学(理科)试题
名校
3 . 给出以下四个命题:
①命题“若
,则
”的逆否命题是“若
,则
”
②命题“若
或
,则
”的否命题为真命题
③若
为假命题,则
均为假命题
④对于命题
,使得
,则
,均有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c77d129b56255baf3d76eb2a6c2ff.png)
四个命题中,其中是真命题的序号是__________ .
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8a2a94168af9b16ce89271a5d8dc6b.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe436ba908c76027255f3a677bf0657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b943869e5c96a5c7c79774f7a9bbd3.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
④对于命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fac11dd95cb4b78adb817fad02dedb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cd44731d509352f907c9773a42cab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1c77d129b56255baf3d76eb2a6c2ff.png)
四个命题中,其中是真命题的序号是
您最近一年使用:0次
2018-02-28更新
|
476次组卷
|
2卷引用:江西省上高县第二中学2017-2018学年高二上学期期末考试数学(理)试题
名校
4 . 命题
:“若
,则
成等比数列”,则命题
的否命题是____________ (填“真”或“假”之一)命题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb02676b3574cf754d12ec04dd144cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2016-12-03更新
|
557次组卷
|
3卷引用:江西省高安中学2019-2020学年高二下学期期中考试数学(文科)试题