14-15高二上·山东淄博·期末
名校
1 . 下列命题中,真命题的有________ .(只填写真命题的序号)
①若
则“
”是“
”成立的充分不必要条件;
②若椭圆
的两个焦点为
,且弦
过点
,则
的周长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a39aeebd0ae3b2d972782afb0c861a.png)
③若命题“
”与命题“
或
”都是真命题,则命题
一定是真命题;
④若命题
:
,
,则
:
.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://img.xkw.com/dksih/QBM/2014/3/27/1571580761915392/1571580767723520/STEM/f0b45eb0bdca4a22ba0160cd39d102ff.png?resizew=39)
②若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57fbdcf5ed16ea6ae22fe7446d9aab97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0169f9fd16b794f51939cb1e8c99dcdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a39aeebd0ae3b2d972782afb0c861a.png)
③若命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.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/9aa8a716a31b0f51b70fdf9bdb257909.png)
④若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://img.xkw.com/dksih/QBM/2014/3/27/1571580761915392/1571580767723520/STEM/a8c28433120a45308e98228629ebb363.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2014/3/27/1571580761915392/1571580767723520/STEM/760bc97d69564f61aa77e031e571cbdd.png?resizew=89)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeaf0c7c8aac29d2b3704f4416724567.png)
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