填空题-单空题 较易0.85 引用1 组卷873
下列结论:
①若命题
命题
则命题
是假命题;
②已知直线
则
的充要条件是
;
③命题“若
则
”的逆否命题为:“若
则
”
④命题“若
,则
或
”的否命题为“若
则
或
”
⑤命题“
”的否定是“
”
其中正确结论的序号是________ (把你认为正确结论的序号都填上)
①若命题
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/34de98b7f18f4359af4662c5cd5d3574.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/e3e477ef096d4fa9ae17f430bf167caa.png?resizew=61)
②已知直线
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/fab84458113b42719b980be8602b26ad.png?resizew=232)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/8def058e02f34d15b2a071666067b7e8.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/3476c67b0f4c4fdb9dd366e7a0061f5f.png?resizew=49)
③命题“若
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/df0b9f3a2c194e0181cd57bccc17bd21.png?resizew=104)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/cfb95aede4ce4777b71cbd64fead3ea7.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/c9018719e2ce43aeb8ed5b2ac3bc7075.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944231223296/1571944236703744/STEM/3aa8358812194037bd633c8f5ffdbcbf.png?resizew=103)
④命题“若
⑤命题“
其中正确结论的序号是
14-15高二上·甘肃天水·期中
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