名校
1 . 已知下列命题:
(1)命题“
,
”的否定是“
,
”;
(2)已知p,q为两个命题,若“
”为假命题“
”为真命题;
(3)“
”是“
”的充分不必要条件;
(4)“若
,则
且
”的逆否命题为真命题.
其中所有真命题的序号是______ .
(1)命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d3a6268e9eded3dba57ab5d93cf556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51397d3252620200d1bfcccf05711082.png)
(2)已知p,q为两个命题,若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3017101fb82a2f3c4a8b0e7879ac0a25.png)
(3)“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055365d21f92fdb6881310bda08c3f75.png)
(4)“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34715101c66fa12ce6baf0a9c53f1672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
其中所有真命题的序号是
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2021-10-15更新
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