已知
为坐标原点,抛物线
上一点
到焦点
的距离为
,若点
为抛物线
准线上的动点,给出以下命题:
①当
为正三角形时,
的值为
;②存在
点,使得
;
③若
,则
等于
;④
的最小值为
,则
等于
或
.
其中正确的是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef1f34ce192480de718e679991932e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ecbec8422e7d36b2ee029596610a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1d1fab0090b027c8cc58e866f0b081.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711918b3d9bd58d71d61d81278821d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eabd458b8542f6727313121985944b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38acfaa0f912c2598cc341ec98da8a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
其中正确的是
20-21高二上·江西南昌·期中 查看更多[4]
江西省南昌市第十中学2020-2021学年高二上学期期中考试数学(理科)试题湖南省邵阳市邵东市第一中学2020-2021学年高二上学期第三次月考数学试题(已下线)练习09+抛物线-2020-2021学年【补习教材·寒假作业】高二数学(理)(北师大版)(已下线)练习09+抛物线-2020-2021学年【补习教材·寒假作业】高二数学(文)(北师大版)
更新时间:2020-11-25 23:23:33
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