2012·北京·一模
1 . 下面给出的四个命题中:
①以抛物线
的焦点为圆心,且过坐标原点的圆的方程为
;
②若
,则直线
与直线
相互垂直;
③命题“
,使得
”的否定是“
,都有
”;
④将函数
的图象向右平移
个单位,得到函数
的图象.
其中是真命题的有___________ (将你认为正确的序号都填上).
①以抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383fcc122f267043fbafe0972bfb900.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0db2c49919467a2e14540f2aabd05cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f2082e494383c81cd6e6bab26abdc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c68e49e43e41daaf08acd26ca1ddc90.png)
③命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://img.xkw.com/dksih/QBM/2014/10/25/1571884589260800/1571884594995200/STEM/5f8df6afcbc4423b81c7689f795b669b.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://img.xkw.com/dksih/QBM/2014/10/25/1571884589260800/1571884594995200/STEM/d19d9ebeeaf9415c98159014a11d2ede.png?resizew=96)
④将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325f9e2f7784ebdd64292e805884dfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232e8cd076dc3f72451b87a5f6540c5e.png)
其中是真命题的有
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