已知一个命题的逆命题是“若
,
,则
,
”,写出原命题的否命题:______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a871ef7bf13de3e15489d65b57a3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d2a320b9ff137ce3632296c4b1d79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b12a22ac48dcbc70d95f03371d874f.png)
更新时间:2019-11-15 20:01:49
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【知识点】 写出原命题的否命题及真假判断
相似题推荐
填空题-单空题
|
较易
(0.85)
【推荐1】以下关于命题的说法正确的有______ (填写所有正确命题的序号).
①“若
,则
”是真命题;
②命题“若
,则
”的否命题是“若
,则
”;
③命题“若
,
都是偶数,则
也是偶数”的逆命题为真命题;
④命题“若
,则
”与命题“若
,则
”等价.
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2c58e340ebcea00ef2a6d05a836301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3019b662e5dc2750bb6f9199d3250f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582ad43edf388c096e7704d92340bf75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5286186cb58bf265a2a96e5195d88d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab92728b35ed5798e07a2b0095bfcc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27dd329517f0dd8f1d0dfade6138ed4.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】给定下列命题:
①“若
有实数根”的逆否命题;
②“若
”的逆命题;
③“若
2”的逆否命题;
④“若
,则
中至少有一个为零”的否命题.
⑤“若
”的逆命题.
其中真命题的序号是________ .
①“若
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/c9d59bc7841b4863a7db4b1fd79d5312.png?resizew=173)
②“若
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/13bcba029bb143228826982ed15b93c8.png?resizew=130)
③“若
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/0fdbc60c2eb948d189be84b62940d81b.png?resizew=113)
④“若
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/9ffae33e3f9e428a99f7953f87f45ea5.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/265d8b8193eb42d2af2cb4044d2f5d8e.png?resizew=26)
⑤“若
![](https://img.xkw.com/dksih/QBM/2016/2/26/1572502278823936/1572502284869632/STEM/1c1251cc00da4e5a8e184da142d23f60.png?resizew=122)
其中真命题的序号是
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